Phonons in YB6 and LaB6: Effects of temperature and pressure

Ponosov Yu. S.; Shitsevalova N. Yu.

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Phonons in YB6 and LaB6: Effects of temperature and pressure

机译：YB6和LaB6中的声子：温度和压力的影响

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Raman scattering by phonons in YB6 and LaB6 has been studied in wide temperature (8-800 K) and pressure (up to 10 GPa) ranges. Acoustic phonons in both hexaborides exhibit anomalous softening with a decrease in the temperature. The positive isothermal Gruneisen coefficient of these modes in YB6 appears to be an order of magnitude lower than the absolute value of the negative isobaric coefficient, which indicates the dominating role of temperature effects. The temperature shifts of the vibration frequencies of the B sublattice in YB6 caused by phonon interactions have the opposite sign and exceed the respective shifts in LaB6.

机译：YB6和LaB6中声子在拉曼散射的研究已经在较宽的温度范围（8-800 K）和压力范围（高达10 GPa）中进行了研究。两种六硼化物中的声子均会随温度降低而出现异常软化。 YB6中这些模式的正等温Gruneisen系数似乎比负等压系数的绝对值低一个数量级，这表明温度效应起主导作用。由声子相互作用引起的YB6中B子晶格振动频率的温度变化具有相反的符号，并超过LaB6中的相应变化。

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《JETP Letters》 |2015年第5期|共6页
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Ponosov Yu. S.; Shitsevalova N. Yu.;
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Phonons in YB6 and LaB6: Effects of temperature and pressure

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