Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 54: Fe-based Superconductors

TT 54.3: Talk

Thursday, March 19, 2020, 10:00–10:15, HSZ 201

Impurity-induced bound states in Fe-based superconductors with spin-orbit coupling — •Peayush Choubey and Ilya Eremin — Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany

We investigate the effects of residual spin-orbit coupling (SOC), inherently present in Fe-based superconductors (FeSCs), and consequent admixture of singlet and triplet Cooper-pairing in the even parity channel in the superconducting state, on the in-gap bound states induced by point-like, magnetic and non-magnetic impurities. Using low-energy models, which capture all the symmetries of FeSCs and treat the atomic SOC consistently, we solve the impurity scattering problem in the T-matrix framework. We find that if s_± pairing state has a significant triplet contribution at the electron pockets around M=(π, π)-point, the impurity-induced bound states are robust against the out-of-plane Zeeman field. The heavily suppressed Zeeman splitting of impurity states is a consequence of reduction in effective Landé g-factor caused by atomic SOC.