Observation of the non-linear Meissner effect

J. A. Wilcox; M. J. Grant; L. Malone; C. Putzke; D. Kaczorowski; T. Wolf; F. Hardy; C. Meingast; J. G. Analytis; J. H. Chu; I. R. Fisher; A. Carrington

doi:10.1038/s41467-022-28790-y

Observation of the non-linear Meissner effect

J. A. Wilcox, M. J. Grant, L. Malone, C. Putzke, D. Kaczorowski, T. Wolf, F. Hardy, C. Meingast, J. G. Analytis, J. H. Chu, I. R. Fisher, A. Carrington

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7 Citations (SciVal)

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.

Original language	English
Article number	1201
Journal	Nature Communications
Volume	13
Issue number	1
Early online date	7 Mar 2022
DOIs	https://doi.org/10.1038/s41467-022-28790-y
Publication status	Published - 31 Dec 2022

Bibliographical note

Publisher Copyright:
© 2022, The Author(s).

ASJC Scopus subject areas

General Chemistry
General Biochemistry,Genetics and Molecular Biology
General Physics and Astronomy

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Cite this

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title = "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.",

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AU - Wilcox, J. A.

AU - Grant, M. J.

AU - Malone, L.

AU - Putzke, C.

AU - Kaczorowski, D.

AU - Wolf, T.

AU - Hardy, F.

AU - Meingast, C.

AU - Analytis, J. G.

AU - Chu, J. H.

AU - Fisher, I. R.

AU - Carrington, A.

PY - 2022/12/31

Y1 - 2022/12/31

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Observation of the non-linear Meissner effect

Abstract

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