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TT: Fachverband Tiefe Temperaturen

TT 22: Superconductivity: Theory

TT 22.2: Vortrag

Dienstag, 2. April 2019, 09:45–10:00, H7

Investigating the effect of impurities on the superconducting state — •Tom Saunderson¹, Gábor Csire², James Annett¹, Balázs Úfalussy², and Martin Gradhand¹ — ¹HH Wills Laboratory, University of Bristol, UK — ²Wigner Research Centre for Physics, PO Box 49, H-1525 Budapest, Hungary

Our understanding of the superconducting state in real materials is still very limited. Not only are the driving mechanisms for many unconventional superconductors poorly understood but also the coupling to magnetic layers or the effect of impurities represent major conceptual challenges [1]. Furthermore, the effects of interfaces, impurities and spin orbit coupling on spin dependent transport, properties well established in the normal state, attract more and more interest [2]. Here we present the implementation of the Bogoliuobov-de Gennes (BdG) equation into a Green′s function (KKR) first principles method [3]. Due to it being a Green′s function method, it is possible to model bulk materials including impurities and interfaces without the need of artificial supercells. We parameterise the pairing potential but solve the BdG equation self-consistently incorporating the microscopic properties of real materials. Here we are going to present calculations for various test cases of simple superconductors and will investigate the influence of impurities on the superconducting state with a particular future interest in the influence of magnetic impurities.
G. R. Stewart, Adv. in Phys., 66, 75 (2017)
M. Eschrig, Rep. Prog. Phys,, 78, 104501 (2015)
G. Csire et al, Phys. Rev. B,, 91, 165142 (2015)