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Observation of the non-linear Meissner effect.

ABSTRACT: 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.

SUBMITTER: Wilcox JA

PROVIDER: S-EPMC8901765 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature

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Observation of the non-linear Meissner effect.

Wilcox J A JA Grant M J MJ Malone L L Putzke C C Kaczorowski D D Wolf T T Hardy F F Meingast C C Analytis J G JG Chu J-H JH Fisher I R IR Carrington A A

Nature communications 20220307 1

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 CeCoIn<sub>5</sub> and LaFePO which clearly show this non-lin ...[more]

PMID: 35256611

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