In Search of Unambiguous Evidence of the Fulde–Ferrell–Larkin–Ovchinnikov State in Quasi-Low Dimensional Superconductors
In Search of Unambiguous Evidence of the Fulde–Ferrell–Larkin–Ovchinnikov State in Quasi-Low Dimensional Superconductors
复制标题
寻找准低维超导体中富尔德-费雷尔-拉金-奥夫钦尼科夫态的明确证据
DOI：
10.3390/condmat2030030
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发表时间：
2017
影响因子：
3.3
通讯作者：
A. Buzdin
中科院分区：
文献类型：
--
作者：
Mihail D. Croitoru;A. Buzdin
在层间耦合足够弱的层状导体中，面内磁场只产生很小的抗磁电流，轨道破坏被强烈抑制。因此，塞曼效应主要支配自旋单重态超导性，使得空间调制的Fulde-Ferrell-Larkin-Ovchinnikov（FFLO）相的形成在这样的材料中成为可能。尽管经过几十年的艰苦努力，这种状态仍然是一个深刻的谜。然而，在过去的几年里，已经观察到了几个暗示，表明在有机层状超导体中实验实现了FFLO态。FFLO相的出现主要是基于热力学量或微观上的自旋极化分布来证明的，其在面内磁场的存在下在超导状态内表现出异常。然而，超导序参量调制的直接观测至今仍缺乏。最近，理论上已经提出了几种FFLO相位的标志签名，这是其主要特征的直接结果，即序参量的空间调制，因此可以提供FFLO的无可争议的证据。在这篇文章中，这些签名和基本的理论框架进行了审查，目的是总结迄今为止所获得的结果，省略重复，并强调其背后的思想和物理。
In layered conductors with a sufficiently weak interlayer coupling in-plane magnetic field cause only small diamagnetic currents and the orbital depairing is strongly suppressed. Therefore, the Zeeman effect predominantly governs the spin-singlet superconductivity making the formation of the spatially modulated Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) phase possible in such materials. Despite decades of strenuous effort, this state still remains a profound mystery. In the last several years, however, there have been observed several hints indicating the experimental realization of the FFLO state in organic layered superconductors. The emergence of the FFLO phase has been demonstrated mainly based on thermodynamic quantities or microscopically with spin polarization distribution that exhibit anomalies within the superconducting state in the presence of the in-plane magnetic field. However, the direct observation of superconducting order parameter modulation is so far missing. Recently, there have been proposed theoretically several hallmark signatures for FFLO phase, which are a direct consequence of its main feature, the spatial modulation of the order parameter, and hence can provide incontrovertible evidence of FFLO. In this article, a review of these signatures and the underlying theoretical framework is given with the purpose to summarize the results obtained so far, omitting duplications, and to emphasize the ideas and physics behind them.
远高于超导一维Li0.9Mo6O17单晶顺磁破对极限的上临界磁场
影响因子：
8.6
作者：
Mercure, J. -F.;Bangura, A. F.;Hussey, N. E.
通讯作者：
Hussey, N. E.