Spin waves in paramagnetic BCC iron: spin dynamics simulations
Materials Science
2007-05-23 v1
Abstract
Large scale computer simulations are used to elucidate a longstanding controversy regarding the existence, or otherwise, of spin waves in paramagnetic BCC iron. Spin dynamics simulations of the dynamic structure factor of a Heisenberg model of Fe with first principles interactions reveal that well defined peaks persist far above Curie temperature T_c. At large wave vectors these peaks can be ascribed to propagating spin waves, at small wave vectors the peaks correspond to over-damped spin waves. Paradoxically, spin wave excitations exist despite only limited magnetic short-range order at and above T_c.
Keywords
Cite
@article{arxiv.cond-mat/0501713,
title = {Spin waves in paramagnetic BCC iron: spin dynamics simulations},
author = {Xiuping Tao and D. P. Landau and T. C. Schulthess and G. M. Stocks},
journal= {arXiv preprint arXiv:cond-mat/0501713},
year = {2007}
}
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