Vortex lattice melting line in superconductors with paramagnetic pair breaking

Article

关键词: TYPE-2 SUPERCONDUCTORS;    MAGNETIC-PROPERTIES;    FLUCTUATIONS;    FIELD;    PHASE;    ORDER;   

DOI  :  10.1103/PhysRevB.106.024508

来源: SCIE

【 摘 要 】

Recent experiments on the iron-based superconductor FeSe in a high magnetic field have suggested the presence of both the fluctuation-induced vortex liquid regime and a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) vortex lattice. To get a general picture of the magnetic phase diagram in type II superconductors with strong superconducting (SC) fluctuation and strong paramagnetic pair breaking (PPB) such as FeSe, the vortex lattice melting curve H-m(T) is theoretically investigated in situations where a FFLO state is expected to occur. In general, PPB tends to narrow the vortex liquid regime intervening between H-c2(T) and H-m(T). In particular, the vortex liquid regime is found to rapidly shrink upon entering; by cooling, the temperature range in which the FFLO state with a periodic modulation parallel to the magnetic field is stable in mean-field theory. Based on the present results, the high-field SC phase diagrams of FeSe in the parallel and perpendicular field configurations are discussed.

【 授权许可】

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