Thermodynamic evidence for the formation of a Fulde-Ferrell-Larkin-Ovchinnikov phase in the organic superconductor λ-(BETS)2GaCl4
Thermodynamic evidence for the formation of a Fulde-Ferrell-Larkin-Ovchinnikov phase in the organic superconductor λ-(BETS)2GaCl4
复制标题
有机超导体 λ-(BETS)2GaCl4 中 Fulde-Ferrell-Larkin-Ovchinnikov 相形成的热力学证据
DOI：
10.1103/physrevb.103.l220501
复制
发表时间：
2021
影响因子：
3.7
通讯作者：
Nakazawa Y.
中科院分区：
文献类型：
--
作者：
Imajo S.;Kobayashi T.;Kawamoto A.;Kindo K.;Nakazawa Y.
在这项工作中，有机超导体的热力学性质进行了调查，研究了高场超导状态被称为假定的Fulde-Ferrell-Larkin-Ovchinnikov（FFLO）相。我们观察到一个小的热力学异常的字段T，这对应于泡利限制字段。这种反常现象可能源于从均匀超导态到FFLO态的转变。热力学的反常现象被消除了。如果磁场不平行于导电平面，即使偏离，低温上临界场也会发生显著变化。这种行为表明，高场态是非常不稳定的，因为它受到强烈的各向异性轨道效应的影响。我们的结果与理论预言的FFLO态相一致，并且从热力学的角度表明，高场超导可能是一种FFLO态。
In this work, the thermodynamic properties of the organic superconductorare investigated to study a high-field superconducting state known as the putative Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. We observed a small thermodynamic anomaly in the fieldT, which corresponds to the Pauli limiting field. This anomaly probably originates from a transition from a uniform superconducting state to the FFLO state.does not show a strong-field angular dependence due to a quasi-isotropic paramagnetic effect in. The thermodynamic anomaly atis smeared out. and the low-temperature upper critical fieldchanges significantly if fields are not parallel to the conducting plane, even for a deviation of. This behavior indicates that the high-field state is very unstable, as it is influenced by the strongly anisotropic orbital effect. Our results are consistent with the theoretical predictions on the FFLO state and show that the high-field superconductivity is probably an FFLO state infrom a thermodynamic point of view.