Fulde–Ferrell–Larkin–Ovchinnikov and vortex phases in a layered organic superconductor
Fulde–Ferrell–Larkin–Ovchinnikov and vortex phases in a layered organic superconductor
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DOI：
10.1038/s41535-019-0147-2
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发表时间：
2019-02
影响因子：
5.7
通讯作者：
S. Sugiura;T. Isono;T. Terashima;S. Yasuzuka;J. Schlueter;S. Uji
中科院分区：
文献类型：
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作者：
S. Sugiura;T. Isono;T. Terashima;S. Yasuzuka;J. Schlueter;S. Uji
超导性是固体物理学中最有趣的话题之一。一般来说，超导库珀对被塞曼效应破坏，这就产生了所谓的泡利顺磁极限。然而，当超导性处于清洁极限并且轨道效应被强烈淬灭时，Cooper对甚至可以在hpauli以上存在，即所谓的Fulde和Ferrell，以及Larkin和Ovchinnikov （FFLO）相。为了发现FFLO阶段，已经进行了大量的工作。然而，涡旋相变在实验数据的解释中引起了相当大的模糊性。在这里，我们报告了高度二维有机超导体中FFLO相变的综合磁热学和扭矩研究。我们观察到FFLO相变明显不同于涡旋熔化相变。相位图提供了FFLO相位在磁场中的稳定性的重要信息。
Superconductivity is one of the most intriguing topics in solid state physics. Generally, the superconducting Cooper pairs are broken by the Zeeman effect, which gives the so-called Pauli paramagnetic limitHPauli. However, when the superconductivity is in the clean limit and the orbital effect is strongly quenched, the Cooper pairs can survive even aboveHPauli, which is the so-called Fulde and Ferrell, and Larkin and Ovchinnikov (FFLO) phase. Extensive efforts have been devoted to the discovery of the FFLO phase. However, vortex phase transitions have given rise to considerable ambiguity in the interpretation of the experimental data. Here, we report comprehensive magnetocaloric and torque studies of the FFLO phase transition in a highly two-dimensional organic superconductor. We observe the FFLO phase transition clearly distinct from vortex melting transitions. The phase diagram provides crucial information on the stability of the FFLO phase in magnetic fields.