Temperature Dependent Magnon-Phonon Coupling in bcc Fe from Theory and Experiment

被引：100
作者：
Koermann, F. [1 ]
Grabowski, B. [1 ]
Dutta, B. [1 ]
Hickel, T. [1 ]
Mauger, L. [2 ]
Fultz, B. [2 ]
Neugebauer, J. [1 ]
机构：
[1] Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, Germany
[2] CALTECH, Pasadena, CA 91125 USA
来源：
PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 16期
基金：
欧洲研究理事会;
关键词：
D O I：
10.1103/PhysRevLett.113.165503
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页数：5
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