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2 results on '"Fumega, Adolfo O."'

1. Tuning coherent-phonon heat transport in LaCoO3/SrTiO3 superlattices

Author

Ministerio de Economía y Competitividad (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Xunta de Galicia, Generalitat de Catalunya, Ministerio de Educación, Cultura y Deporte (España), Bugallo, David, Langenberg, Eric, Carbó-Argibay, E., Varela Dominguez, Noa, Fumega, Adolfo O., Pardo, Victor, Lucas, I., Morellón, Luis, Rivadulla, Francisco, Ministerio de Economía y Competitividad (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Xunta de Galicia, Generalitat de Catalunya, Ministerio de Educación, Cultura y Deporte (España), Bugallo, David, Langenberg, Eric, Carbó-Argibay, E., Varela Dominguez, Noa, Fumega, Adolfo O., Pardo, Victor, Lucas, I., Morellón, Luis, and Rivadulla, Francisco

Abstract

Accessing the regime of coherent phonon propagation in nanostructures opens enormous possibilities to control the thermal conductivity in energy harvesting devices, phononic circuits, etc. In this paper we show that coherent phonons contribute substantially to the thermal conductivity of LaCoO3/SrTiO3 oxide superlattices, up to room temperature. We show that their contribution can be tuned through small variations of the superlattice periodicity, without changing the total superlattice thickness. Using this strategy, we tuned the thermal conductivity by 20% at room temperature. We also discuss the role of interface mixing and epitaxial relaxation as an extrinsic, material dependent key parameter for understanding the thermal conductivity of oxide superlattices.

Published
2021

2. Absence of ferromagnetism in VSe2 caused by Its charge density wave phase

Author

Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Agencia Estatal de Investigación (España), Rogero, Celia [0000-0002-2812-8853], Gargiani, P. [0000-0002-6649-0538], Pardo, Victor [0000-0002-4713-3519], Fumega, Adolfo O., Gobbi, Marco, Dreher, Paul, Wan, Wen, González-Orellana, Carmen, Peña-Díaz, Marina, Rogero, Celia, Herrero-Martín, Javier, Gargiani, Pierluigi, Ilyn, Max, Ugeda, Miguel M., Pardo, Victor, Blanco-Canosa, Santiago, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Agencia Estatal de Investigación (España), Rogero, Celia [0000-0002-2812-8853], Gargiani, P. [0000-0002-6649-0538], Pardo, Victor [0000-0002-4713-3519], Fumega, Adolfo O., Gobbi, Marco, Dreher, Paul, Wan, Wen, González-Orellana, Carmen, Peña-Díaz, Marina, Rogero, Celia, Herrero-Martín, Javier, Gargiani, Pierluigi, Ilyn, Max, Ugeda, Miguel M., Pardo, Victor, and Blanco-Canosa, Santiago

Abstract

How magnetism emerges in low-dimensional materials such as transition metal dichalcogenides at the monolayer limit is still an open question. Herein, we present a comprehensive study of the magnetic properties of single-crystal and monolayer VSe, both experimentally and ab initio. Magnetometry, X-ray magnetic circular dichrosim (XMCD), and ab initio calculations demonstrate that the charge density wave in bulk stoichiometric VSe causes a structural distortion with a strong reduction in the density of states at the Fermi level, prompting the system toward a nonmagnetic state but on the verge of a ferromagnetic instability. In the monolayer limit, the structural rearrangement induces a Peierls distortion with the opening of an energy gap at the Fermi level and the absence of magnetic order. Control experiments on defect-induced VSe single crystals show a breakdown of magnetism, discarding vacancies as a possible origin of magnetic order in VSe.

Published
2019

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