Low Temperature Physics: 39, 225 (2013); https://doi.org/10.1063/1.4794996 (7 pages)
Физика Низких Температур: Том 39, Выпуск 3 (Март 2013), c. 293-300    ( к оглавлению , назад )

Emerging evidence for FFLO states in layered organic superconductors (Review Article)

R. Beyer and J. Wosnitza

Hochfeld-Magnetlabor Dresden (HLD), Helmholtz-Zentrum Dresden-Rossendorf and TU Dresden, D-01314 Dresden, Germany
E-mail: j.wosnitza@hzdr.de

Received October 1, 2012


In this short review, we report on the recently found growing experimental evidence for the existence of Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) states in quasi-two-dimensional organic superconductors. At high magnetic fields aligned parallel to the conducting organic layers, we observe an upturn of the upper critical field beyond the Pauli limit, as evidenced by specific-heat and torque-magnetization measurements. Inside the superconducting state a second thermodynamic transition emerges. These features appear only in a very narrow angular region close to parallel-field orientation.

PACS: 74.70.Kn Organic superconductors;
PACS: 74.25.Dw Superconductivity phase diagrams;
PACS: 65.40.Ba Heat capacity;
PACS: 74.25.Bt Thermodynamic properties.

Key words: organic superconductors, FFLO states, thermodynamic properties.