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We study the unconventional superconducting correlations caused by a singleisolated magnetic impurity in a conventional s-wave superconductor. Due to thelocal breaking of time-reversal symmetry, the impurity induces unconventionalsuperconductivity which is even in both space and spin variables but odd undertime inversion. We derive an exact proportionality relation between theeven-frequency component of the local electron density of states and theimaginary part of the odd-frequency local pairing function. By applying thisrelation to scanning tunneling microscopy spectra taken on top of magneticimpurities immersed in a Pb/Si(111) monolayer, we show experimental evidence ofthe occurrence of the odd-frequency pairing in these systems and explicitlyextract its superconducting function from the data.

Unveiling odd-frequency pairing around a magnetic impurity in a superconductor