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32 results on '"Augieri, A"'

1. Unveiling intrinsic material and extrinsic pinning dimensionality in superconductors: Why Fe(Se,Te) is able to mimic YBCO

Author

Gaia Grimaldi, Masood R. Khan, Antonio Leo, Mario Scuderi, Francesco Rizzo, Andrea Augieri, Giuseppe Celentano, Armando Galluzzi, Michela Iebole, Massimiliano Polichetti, Angela Nigro, and Valeria Braccini

Subjects
Physics, Condensed matter physics, Superconductivity, Science
Abstract

Summary: Discovery of iron-based superconductors paved the way to a competitor of high-temperature superconductors, easier to produce, better performing in high fields, and promising to be less expensive. Critical parameters are investigated by resistivity measurements as a function of temperature, field, and angle R(T,H,θ). This work presents a deep analysis of H-θ phase diagram of PLD-processed Fe(Se,Te) superconducting films, thus revealing material and pinning anisotropy at once. By selecting different thresholds along the R(T,H,θ) curves, all possible regimes emerge. Surprisingly, anisotropy arises moving from the upper critical field toward the irreversibility line: gradually a non-monotonous transition from 3D to 2D, and backward to 3D occurs. Although Fe(Se,Te) appears as a 3D superconductor, its anisotropic pinning landscape shows up similarities with an intrinsic layered superconductor and Fe(Se,Te) definitively mimics YBCO. We propose a general method to disentangle, in any other superconductor, material dimensionality and pinning anisotropy that are key constraints for applications.

Published
2024
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4. High-performance Fe(Se,Te) films on chemical CeO2-based buffer layers

Author

L. Piperno, A. Vannozzi, A. Augieri, A. Masi, A. Mancini, A. Rufoloni, G. Celentano, V. Braccini, M. Cialone, M. Iebole, N. Manca, A. Martinelli, M. Meinero, M. Putti, and A. Meledin

Subjects
Medicine, Science
Abstract

Abstract The fabrication of a Fe-based coated conductor (CC) becomes possible when Fe(Se,Te) is grown as an epitaxial film on a metallic oriented substrate. Thanks to the material’s low structural anisotropy, less strict requirements on the template microstructure allow for the design of a simplified CC architecture with respect to the REBCO multi-layered layout. This design, though, still requires a buffer layer to promote the oriented growth of the superconducting film and avoid diffusion from the metallic template. In this work, Fe(Se,Te) films are grown on chemically-deposited, CeO2-based buffer layers via pulsed laser deposition, and excellent properties are obtained when a Fe(Se,Te) seed layer is used. Among all the employed characterization techniques, transmission electron microscopy proved essential to determine the actual effect of the seed layer on the final film properties. Also, systematic investigation of the full current transport properties J(θ, H, T) is carried out: Fe(Se,Te) samples are obtained with sharp superconducting transitions around 16 K and critical current densities exceeding 1 MA cm−2 at 4.2 K in self-field. The in-field and angular behavior of the sample are in line with data from the literature. These results are the demonstration of the feasibility of a Fe-based CC, with all the relative advantages concerning process simplification and cost reduction.

Published
2023
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5. Divertor Tokamak Test facility project: status of design and implementation

Author

Francesco Romanelli, on behalf of DTT Contributors, D. Abate, E. Acampora, D. Agguiaro, R. Agnello, P. Agostinetti, M. Agostini, A. Aimetta, R. Albanese, G. Alberti, M. Albino, E. Alessi, S. Almaviva, M. Alonzo, R. Ambrosino, P. Andreoli, M. Angelone, M. Angelucci, C. Angioni, A. Angrisani Armenio, P. Antonini, D. Aprile, G. Apruzzese, M. Aquilini, G. Aragone, P. Arena, M. Ariola, G. Artaserse, L. Aucone, A. Augieri, F. Auriemma, J. Ayllon Guerola, N. Badodi, B. Baiocchi, L. Balbinot, C. Baldacchini, A. Balestri, T. Barberis, G. Barone, L. Barucca, M. Baruzzo, S. Begozzi, V. Belardi, F. Belli, A. Belpane, F. Beone, S. Bertolami, S. Bianucci, S. Bifaretti, S. Bigioni, W. Bin, P. Boccali, B. Boeswirth, E. Bogazzi, R. Bojoi, S. Bollanti, T. Bolzonella, F. Bombarda, M. Bonan, N. Bonanomi, A. Bonaventura, L. Boncagni, M. Bonesso, D. Bonfiglio, R. Bonifetto, D. Bonomi, D. Borgogno, T. Borzone, S. Botti, E. Boz, F. Braghin, M. Brena, S. Brezinsek, M. Brombin, A. Bruschi, S. Buonocore, P. Buratti, D. Busi, G. Calabrò, M. Caldora, G. Calvo, G. Camera, G. Campana, S. Candela, V. Candela, F. Cani, L. Cantone, F. Capaldo, S. Cappello, M. Caponero, S. Carchella, A. Cardinali, D. Carnevale, L. Carraro, C. Carrelli, V. Casalegno, I. Casiraghi, C. Castaldo, A. Castaldo, G. Castro, A. Carpignano, F. Causa, R. Cavazzana, M. Cavedon, M. Cavenago, M. Cecchini, S. Ceccuzzi, G. Celentano, L. Celona, C. Centioli, G.V. Centomani, S. Cesaroni, A.G. Chiariello, R. Chomicz, C. Cianfarani, F. Cichocki, M. Cinque, A. Cioffi, M. Ciotti, M. Cipriani, S. Ciufo, V. Claps, G. Claps, V. Coccorese, D. Coccorese, A. Colangeli, T. Coltella, F. Consoli, F. Cordella, D. Corradini, O. Costa, F. Crea, A. Cremona, F. Crescenzi, F. Crisanti, G. Cristofari, G. Croci, A. Cucchiaro, D. D’Ambrosio, M. Dal Molin, M. Dalla Palma, F. Danè, C. Day, M. De Angeli, V. De Leo, R. De Luca, E. De Marchi, G. De Marzi, G. De Masi, E. De Nardi, C. De Piccoli, G. De Sano, M. De Santis, G. De Tommasi, A. Del Nevo, A. Delfino, A. Della Corte, P. Deodati, S. Desiderati, E. Di Ferdinando, M.G. Di Florio, G. Di Gironimo, L.E. Di Grazia, V. Di Marzo, F. Di Paolo, E. Di Pietro, M. Di Pietrantonio, M. Di Prinzio, A. Di Silvestre, A. Di Zenobio, R. Dima, A. Domenichelli, A. Doria, G. Dose, S. Dubbioso, S. Dulla, I. Duran, M. Eboli, M. Elitropi, E. Emanuelli, B. Esposito, P. Ettorre, C. Fabbri, F. Fabbri, M. Fadone, M.M. Faggiano, F. Falcioni, M.V. Falessi, F. Fanale, P. Fanelli, A. Fassina, M. Favaretto, G. Favero, M. Ferraris, F. Ferrazza, C. Ferretti, A. Ferro, N. Ferron, C. Fiamozzi Zignani, L. Figini, F. Filippi, M. Filippini, A. Fimiani, M. Fincato, F. Fiorenza, D. Fiorucci, D. Flammini, F. Flora, N. Fonnesu, P. Franz, L. Frassinetti, A. Frattolillo, R. Freda, R. Fresa, A. Frescura, P. Frosi, M. Fulici, M. Furno Palumbo, V. Fusco, P. Fusco, L. Gabellier, P. Gaetani, E. Gaio, E. Gajetti, A. Galatà, J. Galdon Quiroga, D.L. Galindo Huertas, S. Gammino, G. Gandolfo, S. Garavaglia, J. Garcia Lopez, M. Garcia Muñoz, P. Gaudio, M. Gelfusa, G. Gervasini, L. Giannini, M. Giarrusso, C. Gil, F. Giorgetti, E. Giovannozzi, G. Giruzzi, L. Giudicotti, M. Gobbin, G. Gorini, G. Granucci, D. Grasso, T. Grasso, S. Grazioso, H. Greuner, G. Griva, G. Grosso, S. Guerini, J.P. Gunn, V. Hauer, J. Hidalgo Salaverri, M. Hoppe, M. Houry, M. Hoelzl, A. Iaboni, M. Iafrati, A. Iaiunese, V. Imbriani, D. Indrigo, P. Innocente, F. Koechl, B. Končar, A. Kryzhanovskyy, L. Laguardia, D.A. Lampasi, C. Lanchi, F. Lanzotti, A. Lanzotti, M. Laquaniti, F. Leone, J. Li, M. Libè, F. Lisanti, D. Liuzza, F. Locati, R. Lombroni, R. Lorenzini, P. Lorusso, L. Lotto, J. Loureiro, F. Lucca, T. Luda Di Cortemiglia, P. Maccari, G. Maddaluno, S. Magagnino, G. Manca, A. Mancini, P. Mandalà, B. Mandolesi, F. Mandrile, G. Manduchi, S. Manfrin, M. Manganelli, P. Mantica, G. Marchiori, N. Marconato, G. Marelli, A. Mariani, A. Marin, R. Marinari, M. Marinelli, F. Marino, P. Marino, D. Marocco, R. Marsilio, E. Martelli, P. Martin, F. Martinelli, G. Martini, R. Martone, A. Marucci, D. Marzullo, V. Masala, D. Mascali, F. Mascari, A. Masi, N. Massanova, S. Mastrostefano, M. Mattei, G. Mauro, S. Mauro, C. Meineri, L. Melaragni, A. Mele, P. Meller, S. Meloni, I. Menicucci, G. Messina, L. Mezi, G. Miccichè, M. Micheletti, S. Migliori, D. Milanesio, F. Milazzo, R. Milazzo, P. Minelli, S. Minucci, F. Mirizzi, M. Missirlian, D. Monarca, C. Monti, M. Mori, A. Moriani, L. Morici, A. Moro, F. Moro, P. Mosetti, R. Mozzillo, A. Murari, A. Muraro, D. Murra, P. Muscente, S. Musumeci, L. Muzzi, G.F. Nallo, F. Napoli, E. Nardon, E. Naselli, R. Neu, M. Nocente, M. Notazio, S. Nowak, E. Ocello, A. Oliva, V. Orsetti, A. Orsini, F.P. Orsitto, M. Ortino, M. Ottavi, G. Paccagnella, D. Pacella, I. Pagani, N. Paganucci, A. Pagliaro, V. Palazzolo, M. Palermo, S. Palomba, F. Panza, D. Paoletti, M. Parisi, R. Pasqualotto, S. Passarello, M. Passoni, T. Patton, L. Pelliccia, A. Peloso, A. Pepato, E. Perelli, A. Perencin, S. Peruzzo, A. Pesenti, N. Pedroni, P. Petrolini, V. Piergotti, A. Pidatella, L. Pigatto, M. Pillon, T. Pinna, S. Pipolo, S. Piras, C. Piron, L. Piron, A. Pironti, M. Pistilli, D. Placido, A. Pizzuto, P. Platania, A. Polimadei, F. Pollastrone, G.M. Polli, N. Pomaro, F. Pompili, C. Ponti, F. Porcelli, V. Prandelli, A. Previti, A. Princiotta, G. Pucino, F. Quaglia, A. Quercia, F. Raffaelli, G. Ramogida, G. Ranieri, B. Raspante, D. Ravarotto, G.L. Ravera, A. Reale, P. Rebesan, M. Recchia, D. Regine, F. Renno, B. Riccardi, D. Ricci, D. Rigamonti, M. Ripani, N. Rispoli, S. Roccella, G. Rocchi, H. Roche, M. Romanato, F. Romanelli, G. Romanelli, R. Romaniello, A. Romano, M. Romano, R. Romano, R. Rossi, G. Rubinacci, G. Rubino, S. Rubino, J. Rueda Rueda, A. Rufoloni, C. Salvia, P. Salvini, M. Scarpari, A. Salvitti, L. Salvò, S. Sandri, F. Santoro, A. Satriano, L. Savoldi, C. Scardino, G. Schettini, S. Schmuck, J. Scionti, M. Scisciò, M. Scungio, K. Sedlak, L. Senni, G. Sias, A. Sibio, A. Simonetto, L. Singh, A. Sirignano, C. Sozzi, I. Spada, S. Spagnolo, L. Spinicci, G. Spizzo, M. Spolaore, C. Stefanini, H. Strobel, F. Subba, F. Taccogna, B. Taheri, C. Tantos, A. Tarallo, M. Tarantino, G. Tardini, M. Tardocchi, P. Tarfila, A. Tenaglia, C. Terlizzi, D. Terranova, D. Testa, E. Testa, R. Testoni, V. Toigo, G. Torrisi, A. Trotta, G. Trovato, E. Tsitrone, A. Tuccillo, O. Tudisco, M. Turcato, S. Turtù, A. Uccello, M. Ugoletti, O. Uras, M. Uras, M. Utili, V. Vaccaro, F. Valentini, L. Valletti, M. Valisa, D. Van Eester, D. Vanzan, E. Vassallo, G. Vecchi, M. Vellucci, I. Venneri, G. Ventura, M. Veranda, L. Verdini, C. Verona, G. Verona Rinati, F. Veronese, N. Vianello, F. Viganò, O. Villano, R. Villari, F. Villone, P. Vincenzi, V. Vitale, F. Vivio, G. Vlad, M. Wischmeier, H.S. Wu, I. Wyss, R. Zanino, B. Zaniol, F. Zanon, A. Zappatore, G. Zavarise, P. Zito, A. Zoppoli, M. Zucchetti, M. Zuin, and P. Zumbolo

Subjects
divertor, exhaust, plasma scenarios, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

An overview is presented of the progress since 2021 in the construction and scientific programme preparation of the Divertor Tokamak Test (DTT) facility. Licensing for building construction has been granted at the end of 2021. Licensing for Cat. A radiologic source has been also granted in 2022. The construction of the toroidal field magnet system is progressing. The prototype of the 170 GHz gyrotron has been produced and it is now under test on the FALCON facility. The design of the vacuum vessel, the poloidal field coils and the civil infrastructures has been completed. The shape of the first DTT divertor has been agreed with EUROfusion to test different plasma and exhaust scenarios: single null, double null, X-divertor and negative triangularity plasmas. A detailed research plan is being elaborated with the involvement of the EUROfusion laboratories.

Published
2024
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7. Development of Ca/K-1144 IBS Wires With Composite Cu/Ta Sheaths

Author

Masi, Andrea, primary, Armenio, Achille Angrisani, additional, Augieri, Andrea, additional, Celentano, Giuseppe, additional, Duchenko, Anastasiya, additional, Pompeo, Nicola, additional, Rufoloni, Alessandro, additional, Vannozzi, Angelo, additional, and Varsano, Francesca, additional

Published
2024
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9. Zr:CeO2 Buffer by CSD on Ni-W Substrate for Low-Cost Fe(Se,Te) Coated Conductor

Author

Vannozzi, Angelo, primary, Piperno, Laura, additional, Rufoloni, Alessandro, additional, Botti, Sabina, additional, Bonfigli, Francesca, additional, Iebole, Michela, additional, Savio, Letizia, additional, Cialone, Matteo, additional, Masi, Andrea, additional, Mancini, Antonella, additional, Augieri, Andrea, additional, Celentano, Giuseppe, additional, Braccini, Valeria, additional, and Putti, Marina, additional

Published
2024
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14. Design and Feasibility Assessment of an HTS Sector Shaped High-Current Conductor for Fusion Coils

Author

L. Muzzi, A. Augieri, G. Celentano, S. Chiarelli, A. della Corte, G. De Marzi, A. Di Zenobio, L. Giannini, M. Marchetti, A. Masi, G. Messina, A. Rufoloni, S. Turtu, A. Vannozzi, A. Bragagni, M. Seri, M. Arabi, A. Anemona, and A. Formichetti

Subjects
Electrical and Electronic Engineering, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
Published
2023
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15. Design and Feasibility Assessment of an HTS Sector Shaped High-Current Conductor for Fusion Coils

Author

Muzzi, L., primary, Augieri, A., additional, Celentano, G., additional, Chiarelli, S., additional, della Corte, A., additional, De Marzi, G., additional, Di Zenobio, A., additional, Giannini, L., additional, Marchetti, M., additional, Masi, A., additional, Messina, G., additional, Rufoloni, A., additional, Turtu, S., additional, Vannozzi, A., additional, Bragagni, A., additional, Seri, M., additional, Arabi, M., additional, Anemona, A., additional, and Formichetti, A., additional

Published
2023
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16. Investigation of diethanolamine (DEA) as a chelating agent in the fabrication of fluorine-free propionate route YBa2Cu3O7 (YBCO) thin films

Author

European Atomic Energy Community, Technical University of Cluj-Napoca, Ministry of Education and Research (Romania), Ministerio de Ciencia, Innovación y Universidades (España), Nasui, Mircea [0000-0002-4792-2032], Petrisor, Traian [0000-0002-5430-075X], Sonher, Ramona Bianca [0000-0001-9684-4942], Augieri, Andrea [0000-0002-0942-0752], Palau, Anna [0000-0002-2217-164X], Vannozzi, Angelo [0000-0003-4628-4312], Celentano, Giuseppe [0000-0001-6017-0739], Ciontea, Lelia [0000-0002-5303-2570], Petrisor, Traian [0000-0002-0695-6367], Daniel, Andrada, Nasui, Mircea, Petrisor, Traian, Sonher, Ramona Bianca, Augieri, Andrea, Pop, Cornelia, Palau, Anna, Vannozzi, Angelo, Celentano, Giuseppe, Ciontea, Lelia, European Atomic Energy Community, Technical University of Cluj-Napoca, Ministry of Education and Research (Romania), Ministerio de Ciencia, Innovación y Universidades (España), Nasui, Mircea [0000-0002-4792-2032], Petrisor, Traian [0000-0002-5430-075X], Sonher, Ramona Bianca [0000-0001-9684-4942], Augieri, Andrea [0000-0002-0942-0752], Palau, Anna [0000-0002-2217-164X], Vannozzi, Angelo [0000-0003-4628-4312], Celentano, Giuseppe [0000-0001-6017-0739], Ciontea, Lelia [0000-0002-5303-2570], Petrisor, Traian [0000-0002-0695-6367], Daniel, Andrada, Nasui, Mircea, Petrisor, Traian, Sonher, Ramona Bianca, Augieri, Andrea, Pop, Cornelia, Palau, Anna, Vannozzi, Angelo, Celentano, Giuseppe, and Ciontea, Lelia

Abstract

The role of diethanolamine (DEA) as a chelating agent was investigated in a fluorine-free precursor solution for the growth of superconducting YBa2Cu3O7 (YBCO) thin films via chemical solution deposition. Infrared spectroscopy and thermal analyses were employed to elucidate the interactions between the chelating agent and propionate-based coating solution. The physical properties of the as-obtained YBCO films were investigated to assess the effect of DEA addition on film growth. Special emphasis was placed on the determination of superconducting transport properties. These have been investigated in wide magnetic field (0-18 T) and temperature (4.5-77 K) ranges to account for various possible application scenarios. The 100 nm thick YBCO film deposited on a (001) SrTiO3 single-crystal substrate exhibited a critical current density of 4 MA cm-2 at 77 K in self-field.

Published
2022

17. Zr:CeO2 Buffer by CSD on Ni-W Substrate for Low-Cost Fe(Se,Te) Coated Conductor

Author

Vannozzi, Angelo, Piperno, Laura, Rufoloni, Alessandro, Botti, Sabina, Bonfigli, Francesca, Iebole, Michela, Savio, Letizia, Cialone, Matteo, Masi, Andrea, Mancini, Antonella, Augieri, Andrea, Celentano, Giuseppe, Braccini, Valeria, and Putti, Marina

Abstract

Although Fe(Se,Te) film shows limited superconducting properties compared to REBCO in terms of critical temperature and critical current density, it represents a potential low-cost alternative to REBCO-based coated conductor applications at low temperature and high field condition. In fact, due to the low deposition temperature and absence of oxygen, materials constraints are less strict and Fe(Se,Te) coated conductor can be realized using a very simplified architecture. A further process simplification is the use of cube-textured substrate combined with a single buffer layer by chemical solution deposition (CSD), which may provide a cheap, vacuum-free route for oriented template fabrication. Zr-doped CeO2/Ni-W templates were realized by CSD and successfully tested with epitaxial Fe(Se,Te) film growth by pulsed laser deposition showing good superconducting properties. Further, a detailed analysis before and after buffer layer deposition using optical, atomic, and scanning electron microscopy, electron backscattered diffraction and Raman and X-ray photoelectron spectroscopy was carried out to relate Zr-doped CeO2 film quality to Ni-W microstructure, morphology, and composition. Results show that 30-nm-thick Zr-doped CeO2 film is effective to prevent Ni diffusion. Further, buffer-layer quality is mainly dependent on the characteristics of individual Ni-W grains.

Published
2024
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18. Relation Between Composition and Crystalline Structure in Substituted CaKFe4As4

Author

Duchenko, A., Masi, A., Augieri, A., Barba, L., Campi, G., Celentano, G., Gigli, L., Plaisier, J. R., Pompeo, N., Rizzo, F., and Varsano, F.

Abstract

1144 is a family of Iron Based Superconducting Compounds that attracts interest due to its regular structure, composed by an alternance of alkaline and alkaline-earth planes that intercalate Fe-As layers. This rigidity grants to 1144 compounds a stoichiometric nature, and thus a robust critical temperature not affected by chemical inhomogeneities, and a peculiar pinning landscape enhancing critical currents at high fields. Critical currents can be however further enhanced by introducing further defects by means of irradiation and chemical doping on the Fe site. In our works, as a different approach, we evaluate the effect of the alkaline and alkaline-earth aliovalent substitutions. For this scope, CaKFe4As4 polycrystalline powders have been successfully doped by partially replacing Ca with Na and K with Ba by means of a mechanochemically assisted thermal synthesis. Such substituted compounds crystallize in the P4/mmm structure typical of 1144 compounds. X-ray diffraction analysis revealed that depending on the level of substitution the reflections characteristic of the P4/mmm tend to vanish. In particular, peaks analysis has shown that doping introduces increasing disorder in selected crystalline planes. Barium and sodium, as dopant, do not act the same way, the latter being less invasive, so that 1144 structure is preserved up to 40% substitution. The contemporary replacement of potassium and calcium with barium and sodium exhibits an intermediate behavior. Analysis of X-ray diffraction profiles collected as a function of temperature down to 100 K allowed to calculate the thermal expansion coefficients for the synthesized compounds, with CTE values similar for pristine and substituted compounds close to 1 × 10−6K−1 and 3 × 10−5K−1 respectively along the a-axis and c-axis.

Published
2024
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20. All-Chemical YBCO-Based Architecture Using a Simplified Multilayer Buffer Deposition

Author

E. Campagna, L. Piperno, V. Pinto, A. Augieri, A. Rufoloni, A. Mancini, A. Angrisani Armenio, A. Masi, F. Rizzo, M. Salvato, G. Celentano, A. Vannozzi, Campagna, E., Piperno, L., Pinto, V., Augieri, A., Rufoloni, A., Mancini, A., Angrisani Armenio, A., Masi, A., Rizzo, F., Salvato, M., Celentano, G., and Vannozzi, A.

Subjects
Settore FIS/03, multilayer deposition, Zr-doped CeO2, Electrical and Electronic Engineering, Condensed Matter Physics, Buffer layer, chemical solution deposition, Electronic, Optical and Magnetic Materials
Abstract

Chemical solution deposition (CSD) is a versatile and cheap technique widely used for both buffer layer and YBa2Cu3O7-δ (YBCO) epitaxial film growth. One of the main limits hindering the widespread use of the CSD technique in the field of coated conductors is the limited film thickness that can be reached without degradation. Among the different strategies adopted to obtain thicker film by CSD, increase of precursor solution concentration and viscosity can be mentioned. Another interesting approach is the use of multilayer deposition in order to overcome the limits of CSD technique. Multilayer deposition has been so far realized by performing a complete heat treatment - or at least a pyrolysis step - after each deposited layer, resulting in increased processing time and overall cost. In this contribution, we show that an epitaxial multilayer buffer can be easily obtained by means of multiple successive depositions, in which after each layer only a fast drying step of the precursor solution is carried out. In this way, only a single conversion heat treatment can be used. This approach not only allows a significant reduction on the processing time but also it is more suitable for the growth on metallic template. The viability of this approach is shown by using multilayer Zr-doped CeO2 buffer deposition on single crystalline YSZ substrate. It is shown that, up to 8 layers, no significant structural and morphological degradation of the buffer layer occurs. Further, YBCO film grown by CSD was used to test the suitability of multilayer buffer. YBCO film grown on multilayer buffer shows excellent superconducting properties, with zero-resistance critical temperature up to 92 K and a critical current density exceeding 1 MA/cm2 at 77 K in self field.

Published
2022

21. Aliovalent Substitution in 1144 Iron Based Superconductors: Effect on Structure and Superconducting Properties

Author

A. Masi, A. Duchenko, A. Angrisani Armenio, A. Augieri, M. Bellusci, G. Celentano, M. R. Montereali, F. Rizzo, A. Rufoloni, A. Vannozzi, F. Varsano, Masi, A., Duchenko, A., Angrisani Armenio, A., Augieri, A., Bellusci, M., Celentano, G., Montereali, M. R., Rizzo, F., Rufoloni, A., Vannozzi, A., and Varsano, F.

Subjects
Superconducting materials growth, Iron, Pnictides, Iron, Pnictides, Superconducting materials, Superconducting materials growth, Superconducting materials, Electrical and Electronic Engineering, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
Abstract

Ca/K-1144 compounds have been described widely in literature as stoichiometric compounds, with a Ca:K ratio equal to unity. In this work, we demonstrate that Sr ions can substitute K ions in the 1144 lattice. Polycrystalline samples were produced via a mechanochemically assisted synthesis route. Sr substitution in the Ca/K compound leads to a shortening of its c axis, while no differences are appreciable from the morphological point of view. The CaK0.9Sr0.1Fe4As4 compound is characterized by a slightly reduced critical temperature of approximately 31 K, with respect to the 35 K of the pristine compound. The role of lattice distortion carrier concentration or structural disorder that may be accounted for the reduction of critical temperature is here discussed.

Published
2022

22. Chemical CeO2-Based Buffer Layers for Fe(Se,Te) Films

Author

L. Piperno, A. Vannozzi, V. Pinto, A. Augieri, A. Angisani Armenio, F. Rizzo, A. Mancini, A. Rufoloni, G. Celentano, V. Braccini, M. Cialone, M. Iebole, N. Manca, A. Martinelli, M. Putti, G. Sotgiu, A. Meledin, Piperno, L., Vannozzi, A., Pinto, V., Augieri, A., Angrisani Armenio, A., Rizzo, F., Mancini, A., Rufoloni, A., Celentano, G., Braccini, V., Cialone, M., Iebole, M., Manca, N., Martinelli, A., Putti, M., Sotgiu, G., and Meledin, A.

Subjects
polymer-assisted deposition, buffer layer, Surface roughne, Temperature measurement, Surface treatment, iron-based superconductors, coated conductors, Coated Conductor, Metal organic decomposition, Condensed Matter Physics, Chemical solution deposition, chemical solution deposition, Electronic, Optical and Magnetic Materials, Polymer-assisted Deposition, Rough surface, metal organic decomposition, Zr-doped CeO2, Electrical and Electronic Engineering, Iron-based Superconductor, Surface morphology, Film, Buffer layer
Abstract

Among other Fe-based superconductors, Fe(Se,Te) is particularly interesting because of the low structural anisotropy, large upper critical fields, low field dependence of the critical current density and low toxicity. It can also be grown as an epitaxial film on a metallic oriented substrate, making the fabrication of a Fe-based coated conductor (CC) possible. Less strict requirements on the template microstructure allow for the design of a simplified design compared to REBCO CCs. This design requires a buffer layer to promote the oriented growth of the superconducting film and avoid diffusion from the metallic template. In this work, CeO2 based buffer layers are prepared on single crystals via two chemical deposition techniques, metal organic decomposition (MOD) and polymer assisted deposition (PAD). With the design of a suitable thermal treatment, it is possible to obtain oriented buffers with large flat grains and low values of surface roughness. Fe(Se,Te) films are deposited on these templates via laser deposition, and excellent samples are obtained when a Fe(Se,Te) seed layer is used to favour chemical matching with the buffer: sharp superconducting transitions around 16 K and critical current densities exceeding 1 MA cm-2 at 4.2 K in self-field are observed. These results are the demonstration of the feasibility of a Fe-based CC architecture, with all the relative advantages concerning process simplification and cost reduction.

Published
2022

23. Investigation of diethanolamine (DEA) as a chelating agent in the fabrication of fluorine-free propionate route YBa2Cu3O7 (YBCO) thin films

Author

Andrada Daniel, Mircea Nasui, Traian Petrisor Jr, Ramona Bianca Sonher, Andrea Augieri, Cornelia Pop, Anna Palau, Angelo Vannozzi, Giuseppe Celentano, Lelia Ciontea, Traian Petrisor, European Atomic Energy Community, Technical University of Cluj-Napoca, Ministry of Education and Research (Romania), Ministerio de Ciencia, Innovación y Universidades (España), Nasui, Mircea [0000-0002-4792-2032], Petrisor, Traian [0000-0002-5430-075X], Sonher, Ramona Bianca [0000-0001-9684-4942], Augieri, Andrea [0000-0002-0942-0752], Palau, Anna [0000-0002-2217-164X], Vannozzi, Angelo [0000-0003-4628-4312], Celentano, Giuseppe [0000-0001-6017-0739], Ciontea, Lelia [0000-0002-5303-2570], Petrisor, Traian [0000-0002-0695-6367], Nasui, Mircea, Petrisor, Traian, Sonher, Ramona Bianca, Augieri, Andrea, Palau, Anna, Vannozzi, Angelo, Celentano, Giuseppe, and Ciontea, Lelia

Subjects
Fluorine free route, Propionate based solution, Materials Chemistry, Metals and Alloys, Ceramics and Composites, Epitaxial films 2 3 7, Electrical and Electronic Engineering, Superconducting transport properties, YBa Cu O, Condensed Matter Physics, Chelating agent
Abstract

The role of diethanolamine (DEA) as a chelating agent was investigated in a fluorine-free precursor solution for the growth of superconducting YBa2Cu3O7 (YBCO) thin films via chemical solution deposition. Infrared spectroscopy and thermal analyses were employed to elucidate the interactions between the chelating agent and propionate-based coating solution. The physical properties of the as-obtained YBCO films were investigated to assess the effect of DEA addition on film growth. Special emphasis was placed on the determination of superconducting transport properties. These have been investigated in wide magnetic field (0-18 T) and temperature (4.5-77 K) ranges to account for various possible application scenarios. The 100 nm thick YBCO film deposited on a (001) SrTiO3 single-crystal substrate exhibited a critical current density of 4 MA cm-2 at 77 K in self-field., This work was carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom program 2014–2018 and 2019–2020 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. A D acknowledges the financial support of the 'Entrepreneurial skills and research excellence in doctoral and postdoctoral programs -ANTREDOC'—POCU/380/6/13/123927 project. M N and T P Jr acknowledge the financial support of a grant of the Romanian Ministry of Education and Research, CNCS-UEFISCDI, project number PN-III-P1-1.1-TE-2021-1777, within PNCDI III., With funding from the Spanish government through the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000917-S).

Published
2022
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25. Chemical CeO2-Based Buffer Layers for Fe(Se,Te) Films

Author

Piperno, L., primary, Vannozzi, A., additional, Pinto, V., additional, Augieri, A., additional, Armenio, A. Angisani, additional, Rizzo, F., additional, Mancini, A., additional, Rufoloni, A., additional, Celentano, G., additional, Braccini, V., additional, Cialone, M., additional, Iebole, M., additional, Manca, N., additional, Martinelli, A., additional, Putti, M., additional, Sotgiu, G., additional, and Meledin, A., additional

Published
2022
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28. Investigation of diethanolamine (DEA) as a chelating agent in the fabrication of fluorine free propionate route YBa2Cu3O7 (YBCO) thin films

Author

Daniel, Andrada, primary, Nasui, Mircea, additional, Petrişor Jr., Traian, additional, Sonher, Ramona Bianca, additional, Ciontea, Lelia, additional, Augieri, Andrea, additional, Pop, Cornelia, additional, Palau, Anna, additional, Vannozzi, Angelo, additional, Celentano, Giuseppe, additional, and Petrisor, Traian, additional

Published
2022
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29. High-performance Fe(Se,Te) films on chemical CeO2-based buffer layers.

Author

Piperno, L., Vannozzi, A., Augieri, A., Masi, A., Mancini, A., Rufoloni, A., Celentano, G., Braccini, V., Cialone, M., Iebole, M., Manca, N., Martinelli, A., Meinero, M., Putti, M., and Meledin, A.

Subjects
BUFFER layers, METALLIC films, FLUX pinning, SUPERCONDUCTING transitions, PULSED laser deposition, SUPERCONDUCTING films, TRANSMISSION electron microscopy
Abstract

The fabrication of a Fe-based coated conductor (CC) becomes possible when Fe(Se,Te) is grown as an epitaxial film on a metallic oriented substrate. Thanks to the material's low structural anisotropy, less strict requirements on the template microstructure allow for the design of a simplified CC architecture with respect to the REBCO multi-layered layout. This design, though, still requires a buffer layer to promote the oriented growth of the superconducting film and avoid diffusion from the metallic template. In this work, Fe(Se,Te) films are grown on chemically-deposited, CeO2-based buffer layers via pulsed laser deposition, and excellent properties are obtained when a Fe(Se,Te) seed layer is used. Among all the employed characterization techniques, transmission electron microscopy proved essential to determine the actual effect of the seed layer on the final film properties. Also, systematic investigation of the full current transport properties J(θ, H, T) is carried out: Fe(Se,Te) samples are obtained with sharp superconducting transitions around 16 K and critical current densities exceeding 1 MA cm−2 at 4.2 K in self-field. The in-field and angular behavior of the sample are in line with data from the literature. These results are the demonstration of the feasibility of a Fe-based CC, with all the relative advantages concerning process simplification and cost reduction. [ABSTRACT FROM AUTHOR]

Published
2023
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30. DIALOGANDO S'IMPARA.

Author

Angiuli, Lino and Augieri, Carlo Alberto

Subjects
SOCIAL problems, SOCIAL dominance, CULTURAL identity, LITERATURE
Abstract

The article delves into the essence of dialogue and camaraderie, tracing the author's journey through the literary landscape of the 1960s and 1970s in Puglia, Italy. It reflects on the significance of genuine interaction and communal engagement during a period marked by societal upheaval and the struggle against hierarchy. It intertwines personal reflections with broader social observations, highlighting the role of literature in navigating existential dilemmas and cultural alienation.

Published
2023

32. Chemical CeO 2 -Based Buffer Layers for Fe(Se,Te) Films.

Author

Piperno, L., Vannozzi, A., Pinto, V., Augieri, A., Armenio, A. Angisani, Rizzo, F., Mancini, A., Rufoloni, A., Celentano, G., Braccini, V., Cialone, M., Iebole, M., Manca, N., Martinelli, A., Putti, M., Sotgiu, G., and Meledin, A.

Subjects
METALLIC films, BUFFER layers, CERIUM oxides, SUPERCONDUCTING transitions, SUPERCONDUCTING films, SURFACE roughness
Abstract

Among other Fe-based superconductors, Fe(Se,Te) is particularly interesting because of the low structural anisotropy, large upper critical fields, low field dependence of the critical current density and low toxicity. It can also be grown as an epitaxial film on a metallic oriented substrate, making the fabrication of a Fe-based coated conductor (CC) possible. Less strict requirements on the template microstructure allow for the design of a simplified design compared to REBCO CCs. This design requires a buffer layer to promote the oriented growth of the superconducting film and avoid diffusion from the metallic template. In this work, CeO2 based buffer layers are prepared on single crystals via two chemical deposition techniques, metal organic decomposition (MOD) and polymer assisted deposition (PAD). With the design of a suitable thermal treatment, it is possible to obtain oriented buffers with large flat grains and low values of surface roughness. Fe(Se,Te) films are deposited on these templates via laser deposition, and excellent samples are obtained when a Fe(Se,Te) seed layer is used to favour chemical matching with the buffer: sharp superconducting transitions around 16 K and critical current densities exceeding 1 MA cm−2 at 4.2 K in self-field are observed. These results are the demonstration of the feasibility of a Fe-based CC architecture, with all the relative advantages concerning process simplification and cost reduction. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
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