高压高频超声测量研究SmOs4Sb12中4f电子的局域特性和超声色散
Study of Localized Character of 4f Electrons and Ultrasonic Dispersions in SmOs4Sb12 by High-Pressure High-Frequency Ultrasonic Measurements
摘要：
我们提出了高频超声测量填充方钴矿SmOs $_4$ Sb $_{12}$在静水压力下。结果表明，该化合物中的4个$f$电子从在环境压力下的离域转变为在高压下的局域化，其交叉压力约为0.7 GPa。在压力下4个$f$电子的这种剧烈变化显然与非费米液体状态有关，该状态出现在0.5-1.5 GPa的中间压力范围内。结果或我们的分析强烈地表明，铁八极相互作用在高压下成为主导。此外，我们报告的压力依赖性的超声波分散，这是由于嘎嘎作响，在很宽的范围内的超声波频率高达323 MHz。超声波色散的剧烈变化和频率依赖的弹性异常在$C_{11}$模式在较低的温度意味着一个可能的耦合振动声子和4 $f$电子之间。
英文摘要：
We present high-frequency ultrasonic measurements on the filled skutterudite SmOs$_4$Sb$_{12}$ under hydrostatic pressure. The results clarify that the 4$f$ electrons in this compound transform from delocalized at ambient pressure to localized at high pressures with a crossover pressure of approximately 0.7 GPa. This drastic change in the 4$f$ electrons under pressure is apparently related to the non-Fermi liquid state, which appears in an intermediate-pressure range of 0.5-1.5 GPa. The results or our analysis strongly suggest that the ferro-octupolar interaction becomes dominant at high pressure. Moreover, we report the pressure dependence of the ultrasonic dispersion, which is due to rattling, over a wide range of ultrasonic frequencies up to 323 MHz. The drastic change in the ultrasonic dispersions and the frequency dependent elastic anomaly in the $C_{11}$ mode at lower temperatures imply a possible coupling between rattling phonons and 4$f$ electrons.
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