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Neutron TAS spin-echo - a handle to anharmonic effects in lattice dynamics

机译:中子TAS自旋回波-处理晶格动力学中非谐效应的方法

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摘要

The combination of two traditional neutron techniques-three-axis spectroscopy and spin-echo spectroscopy-opens access to experimental studies of weak anharmonic effects in lattice dynamics, such as thermal variation of phonon frequencies and their natural line widths in crystals far from structural phase transitions. The present paper summarizes the most important features of the technique and illustrates them by data obtained in the course of a recent study of phonon anharmonicity and isotopic disorder effects in germanium single crystals. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 13]
机译:三轴光谱法和自旋回波光谱法这两种传统中子技术的结合,开启了对晶格动力学中弱非谐效应的实验研究的通道,例如声子频率的热变化及其在晶体中的自然线宽,远离结构相变。本文总结了该技术的最重要特征,并通过最近对锗单晶中声子非谐性和同位素无序效应的研究获得的数据对它们进行了说明。 (C)2002 Elsevier Science B.V.保留所有权利。 [参考:13]

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