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

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...

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Bibliographic Details
Published in:Crystals (Basel) 2021-12, Vol.11 (12), p.1525
Main Authors: Sugiura, Shiori, Akutsu, Hiroki, Nakazawa, Yasuhiro, Terashima, Taichi, Yasuzuka, Syuma, Schlueter, John A., Uji, Shinya
Format: Article
Language:English
Subjects:
Fermi surfaces
FFLO phase
Interlayers
Magnetic fields
Magnetoresistance
Magnetoresistivity
MATERIALS SCIENCE
organic superconductor
Organic superconductors
Phase stability
Phase transitions
resistance
Single crystals
Structural stability
Superconductivity
Surface stability
Surface structure
vortex dynamics
Vortices
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Summary: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.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst11121525