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PGI-1 Talk: Gabor Csire

Relativistic spin-polarized KKR theory for superconducting multilayers

12 Sep 2017 15:30
PGI Lecture Hall

University of Bristol


In this talk we show the solution of the fully relativistic spin-polarized first principles Bogoliubov-de Gennes equations (combined with a semiphenomenological parametrization of the exchange-correlation functional) for multilayers within multiple scattering theory. In this formalism the Green function and consequently various physical quantities can be calculated easily. Simple conditions are derived for the case when the righ-hand-side and left-hand-side solutions must be treated separately.

Particularly interesting is the so called anomalous charge, as it can be related to the order parameter. Result will be presented for the Nb/Au, Nb/Fe and Nb/Au/Fe overlayer systems. We show that the spin splitting of the electron states in the ferromagnet leads to spatial modulation of the proximity induced pair amplitudes due to Cooper pairs with a finite center of mass momentum showing oscillatory behaviour, similarly to the FFLO state. More interestingly, in case of the Nb/Au/Fe system we also show that the existence of spin-polarized quantum well states can lead to such oscillations of the order parameter in the normal metal.


Prof. Dr. Stefan Blügel
Phone: +49 2461 61-4249
Fax: +49 2461 61-2850
email: s.bluegel@fz-juelich.de