$KDy(MoO_4)_2$中合作Jahn-Teller有序的吸收光谱研究
The cooperative Jahn-Teller ordering investigation by absorption spectra in $KDy(MoO_4)_2$
摘要：
研究了$KDy(MoO_4)_2$在合作Jahn-Teller型有序区的吸收光谱精细结构。相变时发生的光谱中的温度异常与先前观察到的超声特性相关。基于对称性理论，讨论了菱形$D_{2h}$点群的不可约表示的可能活动性，这些不可约表示导致了协同有序下的无公度相.我们认为，耦合的$A_u$型声子模可能导致非公度相的存在，至少在17-12 K温度范围内是可能的。
英文摘要：
Absorption spectra fine structure of $KDy(MoO_4)_2$ in the region of cooperative Jahn-Teller type ordering was studied. Temperature anomalies in the spectra occurring at phase transformation correlate with the ultrasound peculiarities observed earlier. Based on the symmetry approaching, possible activity of the irreducible representations of the rhombic $D_{2h}$ point group was discussed, which lead to the incommensurate phase at cooperative ordering. It was supposed, that coupled $A_u$-type phonon mode may lead to the incommensurate phase existence, which is possible at least in the temperature region 17-12 K.
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