论文标题
本地对称性破坏和低能连续体，k $ _2 $ recl $ _6 $
Local symmetry breaking and low-energy continuum in K$_2$ReCl$_6 $
论文作者
论文摘要
使用极化选择性自发的拉曼散射，我们研究了5 $ d $过渡金属化合物k $ _2 $ recl $ _6 $，该$ _6 $显示了一系列结构相变。我们观察到在立方高温阶段违反拉曼选择规则的行为，以及在调查的温度范围内持续存在的低能量散射连续体持续存在，从300到5 k。连续夫妻夫妇在76 k处的最低结构相位的温度下，在温度下方的一个声音模式下，我们提出了$ sun的最低效果。 Octahedra局部打破了远程立方对称性。相关的非磁性复合k $ _2 $ sncl $ _6 $的一致结果支持此解释。
Using polarization selective spontaneous Raman scattering, we have investigated the 5$d$ transition metal compound K$_2$ReCl$_6$ which displays a series of structural phase transitions. We observe a violation of the Raman selection rules in the cubic high temperature phase as well as a low-energy scattering continuum persistent throughout the investigated temperature range from 300 down to 5 K. The continuum couples to one of the phonon modes at temperatures above the lowest structural phase transition at 76 K. We propose a common origin of these observations caused by local fluctuations in the orientation of the ReCl$_6$ octahedra which locally break the long-range cubic symmetry. Consistent results from the related non-magnetic compound K$_2$SnCl$_6$ support this interpretation.
