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首页> 外文期刊>Physics of the solid state >Anomalous low-frequency phonons in ZrB12
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Anomalous low-frequency phonons in ZrB12

机译：ZRB12中的异常低频声音

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摘要

The influence of pressure and temperature on low-frequency lines (100-300 cm(-1)) in Raman spectra of ZrB12 and LuB12 single crystals has been investigated. These spectral features have been identified as one-phonon and two-phonon excitations of the acoustic branches of the phonon spectrum. It has been found that the observed spectra of ZrB12 single crystals are more structured and indicate the development of phonon anomalies with a decrease in the temperature. Despite the fact that the low-frequency features in the phonon spectrum of ZrB12 are characterized by a high value of the isothermal Gruneisen parameter, their isobaric Gruneisen parameter has a negative value. This indicates large contributions from the fourth-order anharmonicity, which significantly exceed the volume effects. The appearance of narrow lines in the frequency range from 155 to 175 cm(-1) at temperatures T < 100 K suggests the possibility of a structural transition with an incomplete softening of the lattice.
机译：研究了压力和温度对ZrB12和LuB12单晶拉曼光谱低频谱线（100-300cm（-1））的影响。这些光谱特征被确定为声子谱的声学分支的一个声子和两个声子激发。研究发现，ZrB12单晶的观察光谱更具结构，表明随着温度的降低，声子异常的发展。尽管ZrB12声子谱的低频特征以等温Gruneisen参数的高值为特征，但其等压Gruneisen参数具有负值。这表明四阶非谐性的贡献很大，显著超过了体积效应。温度T<100 K时，在155到175 cm（-1）的频率范围内出现窄线，表明晶格不完全软化时可能发生结构转变。

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