Anomalous phonon lifetime shortening in paramagnetic CrN caused by spin-lattice coupling

A combined spin and ab initio molecular dynamics study

Journal article (2018)

Authors

Irina Stockem Max-Planck-Institut für Eisenforschung, Linköping University
Anders Bergman CEA-CNRS-INRIA-Universite Paris-Sud-Universite de Versailles
Albert Glensk Max-Planck-Institut für Eisenforschung
Tilmann Hickel Max-Planck-Institut für Eisenforschung
F.H.W. Körmann Max-Planck-Institut für Eisenforschung, (OLD) MSE-7
Blazej Grabowski Max-Planck-Institut für Eisenforschung
Jörg Neugebauer Max-Planck-Institut für Eisenforschung
Björn Alling Max-Planck-Institut für Eisenforschung, Linköping University
Research Group
(OLD) MSE-7
Copyright: © 2018 Irina Stockem, Anders Bergman, Albert Glensk, Tilmann Hickel, F.H.W. Körmann, Blazej Grabowski, Jörg Neugebauer, Björn Alling
DOI: https://doi.org/10.1103/PhysRevLett.121.125902
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Published Date

2018

Language

English

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Research Group

(OLD) MSE-7

Abstract

We study the mutual coupling of spin fluctuations and lattice vibrations in paramagnetic CrN by combining atomistic spin dynamics and ab initio molecular dynamics. The two degrees of freedom are dynamically coupled, leading to nonadiabatic effects. Those effects suppress the phonon lifetimes at low temperature compared to an adiabatic approach. The dynamic coupling identified here provides an explanation for the experimentally observed unexpected temperature dependence of the thermal conductivity of magnetic semiconductors above the magnetic ordering temperature.

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