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Start Over Descriptor "FFLO phase" Topic organic superconductor
3 results on '"FFLO phase"'

1. Fermi Surface Structure and Isotropic Stability of Fulde-Ferrell-Larkin-Ovchinnikov Phase in Layered Organic Superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3

Author

Shiori Sugiura, Hiroki Akutsu, Yasuhiro Nakazawa, Taichi Terashima, Syuma Yasuzuka, John A. Schlueter, and Shinya Uji

Subjects
organic superconductor, resistance, FFLO phase, vortex dynamics, Crystallography, QD901-999
Abstract

The Fermi surface structure of a layered organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3 was determined by angular-dependent magnetoresistance oscillations measurements and band-structure calculations. This salt was found to have two small pockets with the same area: a deformed square hole pocket and an elliptic electron pocket. Characteristic corrugations in the field dependence of the interlayer resistance in the superconducting phase were observed at any in-plane field directions. The features were ascribed to the commensurability (CM) effect between the Josephson vortex lattice and the periodic nodal structure of the superconducting gap in the Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) phase. The CM effect was observed in a similar field region for various in-plane field directions, in spite of the anisotropic nature of the Fermi surface. The results clearly showed that the FFLO phase stability is insensitive to the in-plane field directions.

Published
2021
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2. New Spin on Metal-Insulator Transitions.

Author

Pustogow, Andrej and Pustogow, Andrej

Subjects
Energy industries & utilities, History of engineering & technology, Technology: general issues, (TMTTF)2X, 13C-NMR, Anderson impurity, Anderson localization, FFLO, FFLO phase, FFLO state, FTIR, Fabre salts, Kondo destruction, Mott insulator, Mott organics, Mott transition, Planckian dissipation, anderson localization, bandwidth tuning, carrier localization, cellular dynamical mean field theory, charge crystal, charge density wave, charge glass, charge order, charge-transfer salts, charge-transfer solid crystals, cluster mean field theory, coherent potential approximation, colossal magnetoresistance, cooling rate, core-shell model, data science, dielectric response, dielectric spectroscopy, dilute 2DEGs, disorder, disordered systems, dynamical cluster approximation, dynamical mean field theory, electric double-layer transistor, electrical resistivity, electron-lattice coupling, extended Hubbard model, geometrical frustration, grain size, heat capacity, heavy fermion compounds, infrared spectroscopy, intra-dimer charge and spin degrees of freedom, low-temperature crystal structure, magnetic exchange beyond Heisenberg, manganites, materials database, metal insulator transition, metal-insulator transition, metal-insulator transitions, molecular conductor, molecular conductors, n/a, negative chemical pressure, negative magnetoresistance, neural network, nickelates, optical conductivity, organic charge-transfer salts, organic conductor, organic conductors, organic superconductor, organics, partial chemical substitution, penetration depth measurement, percolation theory, phase coherence length, phase transitions, quantum criticality, quantum impurity solver, quantum spin liquid, random disorder, relaxor-ferroelectrics, resistance, resistivity maxima, spin density wave, spin liquid, spinon theory, strange metals, strong electron correlations, strongly correlated electron systems, strongly correlated electrons, strongly correlated systems, superconductivity, thermal conductivity, twisted transition-metal dichalcogenide bilayers, two-dimensional metal, typical medium theory, uniaxial strain, variable range hopping, vibrational spectroscopy, vortex dynamics
Abstract

Summary: Metal‒insulator transitions (MITs) constitute a core subject of fundamental condensed matter research. The localization of conduction electrons occurs in a large variety of materials and engenders intriguing quantum phenomena such as unconventional superconductivity and exotic magnetism. Nearby an MIT, minuscule changes of the interaction strength via chemical substitution, doping, physical pressure, or even disorder can trigger spectacular resistivity changes from zero in a superconductor to infinity in an insulator near T = 0. While approaching an insulating state from the conducting side, deviations from Fermi-liquid transport in bad and strange metals are the rule rather than the exception. As the drosophila of electron‒electron interactions, the Mott MIT receives particular attention from theory as it can be studied using the Hubbard model. On the experimental side, organic charge-transfer salts and transition metal oxides are versatile platforms for working toward solving the puzzles of correlated electron systems. This Special Issue provides a view into the ongoing research endeavors investigating emergent phenomena around MITs.

3. Fermi Surface Structure and Isotropic Stability of Fulde-Ferrell-Larkin-Ovchinnikov Phase in Layered Organic Superconductor β ″-(BEDT-TTF) 2 SF 5 CH 2 CF 2 SO 3.

Author

Sugiura, Shiori, Akutsu, Hiroki, Nakazawa, Yasuhiro, Terashima, Taichi, Yasuzuka, Syuma, Schlueter, John A., and Uji, Shinya

Subjects
ORGANIC superconductors, FERMI surfaces, SURFACE structure, STRUCTURAL stability, JOSEPHSON effect, IRON-based superconductors
Abstract

The Fermi surface structure of a layered organic superconductor β ″ -(BEDT-TTF) 2 SF 5 CH 2 CF 2 SO 3 was determined by angular-dependent magnetoresistance oscillations measurements and band-structure calculations. This salt was found to have two small pockets with the same area: a deformed square hole pocket and an elliptic electron pocket. Characteristic corrugations in the field dependence of the interlayer resistance in the superconducting phase were observed at any in-plane field directions. The features were ascribed to the commensurability (CM) effect between the Josephson vortex lattice and the periodic nodal structure of the superconducting gap in the Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) phase. The CM effect was observed in a similar field region for various in-plane field directions, in spite of the anisotropic nature of the Fermi surface. The results clearly showed that the FFLO phase stability is insensitive to the in-plane field directions. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
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