Observation of the non-linear Meissner effect.

Observation of the non-linear Meissner effect.
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观察非线性Meissner效应。

DOI:
10.1038/s41467-022-28790-y
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发表时间:
2022-03-07
影响因子:
16.6
通讯作者:
Carrington A
Carrington A
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wilcox JA;Grant MJ;Malone L;Putzke C;Kaczorowski D;Wolf T;Hardy F;Meingast C;Analytis JG;Chu JH;Fisher IR;Carrington A

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一个长期存在的理论预测是,在干净的、节状的非常规超导体中,零温度下的磁穿透深度λ随磁场线性变化。这种非线性迈斯纳效应是节点态的一种重要表现,与已被充分研究的λ的T线性依赖性一样,但从未被令人信服地实验观察到。在这里,我们提出的节点超导体CeCoIn 5和LaFePO的测量清楚地表明这种非线性迈斯纳效应。我们进一步展示了如何使用小直流磁场对λ(T)的影响来区分间隙节点和非节点深间隙极小值。我们对KFe2As2的测量表明,这种材料具有这样的非节点状态。非线性迈斯纳效应是非传统节点超导体的关键表现,但其实验证据一直难以捉摸。在这里,作者观察到节超导体CeCoIn 5和LaFePO的非线性迈斯纳效应。
A long-standing theoretical prediction is that in clean, nodal unconventional superconductors the magnetic penetration depth λ, at zero temperature, varies linearly with magnetic field. This non-linear Meissner effect is an equally important manifestation of the nodal state as the well studied linear-in-T dependence of λ, but has never been convincingly experimentally observed. Here we present measurements of the nodal superconductors CeCoIn5 and LaFePO which clearly show this non-linear Meissner effect. We further show how the effect of a small dc magnetic field on λ(T) can be used to distinguish gap nodes from non-nodal deep gap minima. Our measurements of KFe2As2 suggest that this material has such a non-nodal state. The non-linear Meissner effect is a key manifestation of unconventional nodal superconductors but its experimental evidence has been elusive. Here, the authors observe the nonlinear Meissner effect in nodal superconductors CeCoIn5 and LaFePO.
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