Regensburg 2019 – scientific programme
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MA: Fachverband Magnetismus
MA 38: Spin hall effects
MA 38.2: Talk
Wednesday, April 3, 2019, 17:30–17:45, H52
Ab initio theory of the spin Hall effect and its application to random Pt-based alloys — •Ilja Turek1, Josef Kudrnovsky2, and Vaclav Drchal2 — 1Institute of Physics of Materials, Czech Acad. Sci., Brno, Czech Republic — 2Institute of Physics, Czech Acad. Sci., Prague, Czech Republic
In this contribution, we present our approach to the spin-dependent conductivity tensor in substitutionally disordered alloys based on the concept of intersite electron transport within the relativistic tight-binding linear muffin-tin orbital (TB-LMTO) method. This approach leads to non-random and spin-independent effective current (velocity) operators, which enables one to define easily the corresponding effective spin-current operators that are non-random as well. The configuration averaging of the Fermi-surface and Fermi-sea terms of the spin-dependent conductivity tensor is performed by means of the coherent potential approximation (CPA) in analogy with that formulated recently for the standard conductivity tensor. The developed theory will be illustrated by studies of the spin Hall effect in selected Pt-based alloys (Pt-Au, Pt-Re, Pt-Ta) focused on the values and concentration trends of the spin Hall conductivity and the spin Hall angle.