RQMP Research Seminar

Odd-frequency superconducting pairing induced by magnetic impurities

Marcello Civelli

Laboratoire de Physique des Solides
Université Paris-Saclay CNRS

We show that a magnetic impurity embedded in a conventional s-wave superconductor can induce odd-frequency unconventional superconductivity, which is even in both space and spin variables but odd under time inversion. We in particular derive a 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 exploiting this relation, we show the experimental realization of the odd-frequency pairing in scanning tunneling microscopy spectra. We finally propose that magnetic impurities diluted in a conventional superconductor can give origin to a superconducting state displaying the odd-frequency component.