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

Vivien Perrin; Flávio L. N. Santos; Gerbold C. Ménard; Christophe Brun; Tristan Cren; Marcello Civelli; Pascal Simon

doi:10.1103/PhysRevLett.125.117003

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

Vivien Perrin, Flávio L. N. Santos, Gerbold C. Ménard, Christophe Brun, Tristan Cren, Marcello Civelli, Pascal Simon

DOI 10.1103/PhysRevLett.125.117003 · Physical Review Letters

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.8	Pressure not reported	onset
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown