Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Spin Hall Effects
MA 3.5: Vortrag
Montag, 31. März 2014, 10:30–10:45, HSZ 403
Phase shift model for the spin Hall effect in dilute metal alloys — •Dmitry Fedorov1, Christian Herschbach1, Annika Johansson2, Martin Gradhand3, Kristina Chadova4, Diemo Ködderitzsch4, Hubert Ebert4, and Ingrid Mertig2,1 — 1Max Planck Institute of Microstructure Physics, Halle, Germany — 2Martin Luther University Halle-Wittenberg, Halle, Germany — 3University of Bristol, Bristol, United Kingdom — 4Ludwig-Maximilians University, Munich, Germany
A renewed interest to the resonant scattering model, derived originally for the description of the anomalous Hall effect, was initiated by Fert and Levy [1]. They considered it for the spin Hall effect in dilute metal alloys. Expressed initially for resonant d scatterers in terms of nonrelativistic phase shifts with a perturbative treatment of spin-orbit coupling (SOC), their model was reformulated later for strong p scatterers using relativistic phase shifts [2].
We developed [3,4] an extension of the relativistic and nonrelativistic resonant scattering model to arbitrary impurity atoms for the skew-scattering mechanism. Despite the generalization, a successful application of the model is restricted to dilute alloys based on host crystals with weak SOC and a free-electron like Fermi surface. This is illustrated by a comparison between the model and our first-principles calculations.
[1] A. Fert and P.M. Levy, PRL 106, 157208 (2011); [2] Y. Niimi et al., PRL 109, 156602 (2012); [3] D.V. Fedorov et al., PRB 88, 085116 (2013); [4] C. Herschbach et al., PRB 88, 205102 (2013).