Journal
CRYSTALS
Volume 11, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/cryst11121525
Keywords
organic superconductor; resistance; FFLO phase; vortex dynamics
Funding
- KAKENHI [17H01144, 20K14400]
- Grants-in-Aid for Scientific Research [20K14400] Funding Source: KAKEN
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The Fermi surface structure of a layered organic superconductor was determined through experiments and computations, with observations of characteristic oscillations in the superconducting phase attributed to a commensurability effect. The results showed that the stability of the FFLO phase is not sensitive to the in-plane field directions.
The Fermi surface structure of a layered organic superconductor beta & DPRIME;-(BEDT-TTF)(2)SF5CH2CF2SO3 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.
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