Spin Dependent Lifetimes and Spin-orbit Hybridization Points in Heusler Compounds

We present an ab initio calculation of the k and spin-resolved electronic lifetimes in the half-metallic Heusler compounds Co(2)MnSi and Co(2)FeSi. We determine the spin-flip and spin-conserving contributions to the lifetimes and study in detail the behavior of the lifetimes around states that are s...

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Bibliographic Details
Published in:arXiv.org 2014-03
Main Authors: Kaltenborn, Steffen, Schneider, Hans Christian
Format: Article
Language:English
Subjects:
Dependence
Electron spin
Iron silicide
Polarization (spin alignment)
Spin dynamics
Spin-orbit interactions
Online Access:Get full text
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Summary:We present an ab initio calculation of the k and spin-resolved electronic lifetimes in the half-metallic Heusler compounds Co(2)MnSi and Co(2)FeSi. We determine the spin-flip and spin-conserving contributions to the lifetimes and study in detail the behavior of the lifetimes around states that are strongly spin-mixed by spin-orbit coupling. We find that, for non-degenerate bands, the spin mixing alone does not determine the energy dependence of the (spin-flip) lifetimes. Qualitatively, the lifetimes reflect the lineup of electron and hole bands. We predict that different excitation conditions lead to drastically different spin-flip dynamics of excited electrons and may even give rise to an enhancement of the non-equilibrium spin polarization.
ISSN:2331-8422
DOI:10.48550/arxiv.1403.2590