4.8 Article

Observation of the non-linear Meissner effect

Journal

NATURE COMMUNICATIONS
Volume 13, Issue 1, Pages -

Publisher

NATURE PORTFOLIO
DOI: 10.1038/s41467-022-28790-y

Keywords

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Funding

  1. EPSRC [EP/R011141/1, EP/L015544/1, EP/H025855/1]
  2. Department of Energy, Office of Basic Energy Sciences [DE-AC02-76SF00515]
  3. National Science Centre (Poland) [2015/19/B/ST3/03158]

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The authors observe the existence of non-linear Meissner effect in two unconventional nodal superconductors and demonstrate its use in distinguishing nodal and non-nodal characteristics.
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. A long-standing theoretical prediction is that in clean, nodal unconventional superconductors the magnetic penetration depth lambda, 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 lambda, 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 lambda(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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