Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 110: Superconductivity: Fe-based Superconductors – Theory

TT 110.8: Vortrag

Freitag, 20. März 2015, 11:30–11:45, H 2053

Unexpected impact of magnetic disorder on multiband superconductivity — •Dmitri Efremov¹, Maxim Korshunov², Alexander Golubov³, and Oleg Dolgov⁴ — ¹IFW Dresden, Germany — ²Kirensky Institute of Physics, Krasnoyarsk, Russia — ³University of Twente, Enschede, The Netherlands — ⁴Max-Planck-Institute for Solid State Physics, Stuttgart, Germany

We analyze how the magnetic disorder affects the properties of the two-band s₊₊ and s₊₋ models, which are subject of hot discussions regarding iron-based superconductors and other multiband systems like MgB₂ . We show that there are several cases when the transition temperature is not fully suppressed by magnetic impurities in contrast to the Abrikosov-Gor’kov theory, but a saturation of Tc takes place in the regime of strong disorder. These cases are: (1) the purely interband impurity scattering, (2) impurity scattering purely in one of the bands, (3) the unitary scattering limit. We show that the a transition between s₊₊ and s₊₋ states may occur with increasing magnetic disorder.