Abstract

An ab initio based framework for quantitatively assessing the phonon contribution due to magnon-phonon interactions and lattice expansion is developed. The theoretical results for bcc Fe are in very good agreement with high-quality phonon frequency measurements. For some phonon branches, the magnon-phonon interaction is an order of magnitude larger than the phonon shift due to lattice expansion, demonstrating the strong impact of magnetic short-range order even significantly above the Curie temperature. The framework closes the previous simulation gap between the ferro- and paramagnetic limits.

Keywords

PhononCondensed matter physicsMagnonCurie temperatureParamagnetismLattice (music)PhysicsAb initioCoupling (piping)Materials scienceFerromagnetismQuantum mechanics

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Year
2014
Type
article
Volume
113
Issue
16
Pages
165503-165503
Citations
106
Access
Closed

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Fritz Körmann, Blazej Grabowski, Biswanath Dutta et al. (2014). Temperature Dependent Magnon-Phonon Coupling in bcc Fe from Theory and Experiment. Physical Review Letters , 113 (16) , 165503-165503. https://doi.org/10.1103/physrevlett.113.165503

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DOI
10.1103/physrevlett.113.165503