Angle-dependent evolution of the Fulde-Ferrell-Larkin-Ovchinnikov state in an organic superconductor.

Journal Article · Sun Jan 01 00:00:00 EST 2012 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.109.027003· OSTI ID:1050181

Beyer, R; Bergk, B; Schlueter, J A; Wosnitza, J ^[1]

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1. Materials Science Division

We report magnetic-field and angular-dependent high-resolution specific-heat measurements of the organic superconductor {beta}{double_prime}-(BEDT-TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}. When the magnetic field is aligned precisely within the conducting BEDT-TTF layer, at low temperatures a clear upturn of the upper critical field beyond the Pauli limit of 9.73 T is observed, hinting at the emergence of a Fulde-Ferrell-Larkin-Ovchinnikov state. This upturn disappears when the field is oriented out of plane by more than {approx}0.5 deg. For smaller out-of-plane angles, the specific-heat anomaly at T{sub c} sharpens and a second peaky phase transition appears within the superconducting state.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 1050181
• Report Number(s): ANL/MSD/JA-72661; PRLTAO; TRN: US201218%%534
• Journal Information: Physical Review Letters, Vol. 109, Issue 2; ISSN 0031-9007
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
BEDT-TTF
CRITICAL FIELD
MAGNETIC FIELDS
ORGANIC SUPERCONDUCTORS
SPECIFIC HEAT