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- Title
Observation of the non-linear Meissner effect.
- Authors
Wilcox, J. A.; Grant, M. J.; Malone, L.; Putzke, C.; Kaczorowski, D.; Wolf, T.; Hardy, F.; Meingast, C.; Analytis, J. G.; Chu, J.-H.; Fisher, I. R.; Carrington, A.
- 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. 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.
- Subjects
MEISSNER effect; PENETRATION depth (Superconductors); SUPERCONDUCTORS; IRON-based superconductors
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-28790-y