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Unveiling Odd-Frequency Pairing around a Magnetic Impurity in a Superconductor
Vivien Perrin1, Flávio L N Santos1,2, Gerbold C Ménard3
1Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France.
Abstract:
We study the unconventional superconducting correlations caused by a single isolated magnetic impurity in a conventional s-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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