Vortex lattice melting line in superconductors with paramagnetic pair breaking
Vortex lattice melting line in superconductors with paramagnetic pair breaking
复制标题
超导体中顺磁对断裂的涡晶格熔化线
DOI：
10.1103/physrevb.106.024508
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Ryusuke Ikeda
中科院分区：
文献类型：
--
作者：
Dai Nakashima;Ryusuke Ikeda
最近的铁基超导体FeSe在强磁场中的实验表明，波动诱导的涡旋液体制度和Fulde-Ferrell-Larkin-Ovchinnikov（FFLO）涡旋晶格的存在。为了得到具有强超导涨落和强顺磁对破缺的第二类超导体（如FeSe）的磁相图的一般图像，从理论上研究了可能出现FFLO态的情况下的涡旋晶格熔化曲线Hm（T）.一般来说，PPB倾向于使介于Hc ε（T）和Hm（T）之间的涡旋液体状态变窄。特别是，涡流液体制度被发现进入后迅速收缩;通过冷却，在平均场理论中，具有平行于磁场的周期性调制的FFLO状态的温度范围是稳定的。在此基础上，讨论了平行场和垂直场结构下FeSe的高场SC相图。
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 Hm (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 Hc₂ (T) and Hm (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.