Article Dans Une Revue Physical Review Letters Année : 2020

Unveiling Odd-Frequency Pairing around a Magnetic Impurity in a Superconductor

Résumé

We study the unconventional superconducting correlations caused by a single isolated magnetic impurity in a conventional [see text] wave superconductor. Because of the local breaking of time-reversal symmetry, the impurity induces unconventional superconductivity, which is even in both space and spin variables but odd under time inversion. We derive an exact proportionality relation between the even-frequency component of the local electron density of states and the imaginary part of the odd-frequency local pairing function. By applying this relation to scanning tunneling microscopy spectra taken on top of magnetic impurities immersed in a Pb/Si(111) monolayer, we show experimental evidence of the occurrence of the odd-frequency pairing in these systems and explicitly extract its superconducting function from the data.

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hal-03060020 , version 1 (04-01-2021)

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Vivien Perrin, Flávio L. n. Santos, Gerbold Ménard, Christophe Brun, Tristan Cren, et al.. Unveiling Odd-Frequency Pairing around a Magnetic Impurity in a Superconductor. Physical Review Letters, 2020, 125 (11), pp.117003. ⟨10.1103/PhysRevLett.125.117003⟩. ⟨hal-03060020⟩
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