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Observation of the non-linear Meissner effect.
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.
Affiliation
  • Wilcox JA; H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK.
  • Grant MJ; H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK.
  • Malone L; H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK.
  • Putzke C; H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK.
  • Kaczorowski D; Laboratory of Quantum Materials, Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland.
  • Wolf T; Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-950, Wroclaw, Poland.
  • Hardy F; Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany.
  • Meingast C; Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany.
  • Analytis JG; Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany.
  • Chu JH; Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, CA, 94305-4045, USA.
  • Fisher IR; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Carrington A; Department of Physics, University of California, Berkeley, CA, 94720, USA.
Nat Commun ; 13(1): 1201, 2022 Mar 07.
Article in En | MEDLINE | ID: mdl-35256611
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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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Nat Commun Year: 2022 Document type: Article
Fulltext
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Nat Commun Year: 2022 Document type: Article