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Observation of the non-linear Meissner effect

Author

Listed:
  • J. A. Wilcox

    (University of Bristol)

  • M. J. Grant

    (University of Bristol)

  • L. Malone

    (University of Bristol)

  • C. Putzke

    (University of Bristol
    École Polytechnique Fédérale de Lausanne (EPFL))

  • D. Kaczorowski

    (Polish Academy of Sciences)

  • T. Wolf

    (Karlsruhe Institute of Technology)

  • F. Hardy

    (Karlsruhe Institute of Technology)

  • C. Meingast

    (Karlsruhe Institute of Technology)

  • J. G. Analytis

    (Stanford University
    SLAC National Accelerator Laboratory
    University of California)

  • J.-H. Chu

    (Stanford University
    SLAC National Accelerator Laboratory
    University of Washington)

  • I. R. Fisher

    (Stanford University
    SLAC National Accelerator Laboratory)

  • A. Carrington

    (University of Bristol)

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.

Suggested Citation

  • 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, 2022. "Observation of the non-linear Meissner effect," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28790-y
    DOI: 10.1038/s41467-022-28790-y
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