Emergent Relativistic Effects in Condensed Matter
From Fundamental Aspects to Electronic Functionality

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22.07.2020

Spin relaxation in s-wave superconductors in the presence of resonant spin-flip scatterers


D. Kochan, M. Barth, A. Costa, K. Richter, J. Fabian

Physical Review Letters

Employing analytical methods and quantum transport simulations we investigate the relaxation of quasiparticle spins in graphene proximitized by an s-wave superconductor in the presence of resonant magnetic and spin-orbit active impurities. , the relaxation with temperature when electrons scatter off magnetic impurities—the Hebel-Slichter effect—and when impurities have spin-orbit coupling. This distinct temperature dependence (not present in the normal state) uniquely discriminates between the two scattering mechanisms. However, we show that the Hebel-Slichter picture breaks down . The emergence of Yu-Shiba-Rusinov bound states within the superconducting gap redistributes the spectral weight away from magnetic resonances. The result is opposite to the Hebel-Slichter expectation: the spin relaxation with temperature. Our findings hold for generic s-wave superconductors with resonant magnetic impurities, but also, as we show, for resonant magnetic Josephson junctions.

 

Phys. Rev. Lett. 125, 087001 (2020)

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