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arXiv 0712.4351cond-mat.mtrl-sci
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金刚石中μ素和氢的扩散

Diffusion of muonium and hydrogen in diamond

Carlos P. Herrero, Rafael Ramirez

摘要:

基于路径积分质心理论,用量子过渡态理论计算了金刚石中μ素和氢的跃迁率。这种技术使我们能够研究振动模式量子化对杂质扩散的有效自由能垒Δ F的影响,这些自由能垒相对于零温度经典计算进行了重整化。对于从四面体(T)位置到键心(BC)位置的跃迁,氢的Δ F大于μ 鎓的Δ F,而从BC到T的跃迁则相反。计算出的有效势垒随温度的升高而降低,除了从T到BC位点的μ素跃迁。计算的跳跃率是在良好的协议,可用的μ子自旋旋转数据。

英文摘要:

Jump rates of muonium and hydrogen in diamond are calculated by quantum transition-state theory, based on the path-integral centroid formalism. This technique allows us to study the influence of vibrational mode quantization on the effective free-energy barriers Delta F for impurity diffusion, which are renormalized respect to the zero-temperature classical calculation. For the transition from a tetrahedral (T) site to a bond-center (BC) position, Delta F is larger for hydrogen than for muonium, and the opposite happens for the transition from BC to T. The calculated effective barriers decrease for rising temperature, except for the muonium transition from T to BC sites. Calculated jump rates are in good agreement to available muon spin rotation data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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