Dynamical thermal conductivity of argon crystal

Hideo Kaburaki; Ju Li; Sidney YipHajime Kimizuka

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Dynamical thermal conductivity of argon crystal

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The thermal conductivity of a rare-gas crystal (Ar) is computed using equilibrium molecular dynamics in conjunction with the Green-Kubo linear response formalism, and the Lennard-Jones potential with an appropriately long cutoff (4σ). Besides predicting absolute values of the conductivity from low temperature up to the liquid, the approach allows heat conduction to be understood as a dynamical process through the temporal behavior of the heat current correlation function. At low temperatures the correlation function shows a characteristic two-stage decay, a short-time relaxation which we attribute to single-particle motions in a local environment, and a more extended component corresponding to collective atomic motions (phonons). As temperature increases the second correlation component diminishes much faster than the first component, indicating a transition from mainly phase-coherent phonon transport to mainly phase-incoherent interatomic energy transfer in solids.

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来源
《Journal of Applied Physics》 |2007年第4期|043514.1-043514.6|共9页
作者
Hideo Kaburaki; Ju Li; Sidney YipHajime Kimizuka;
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作者单位

Center for Computational Science and e-Systems, Japan Atomic Energy Agency, Tokai 319-1195, Japan;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类应用物理学;计量学;
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Dynamical thermal conductivity of argon crystal

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