Estimation of charge-ordering patterns in θ − ET 2 MM ′ ( SCN ) 4 ( M M ′ = R b C o , R b Z n , CsZn ) by reflection spectroscopy
Estimation of charge-ordering patterns in θ − ET 2 MM ′ ( SCN ) 4 ( M M ′ = R b C o , R b Z n , CsZn ) by reflection spectroscopy
复制标题
通过反射光谱估计 θ − ET 2 MM ′ ( SCN ) 4 ( M M ′ = R b Co , R b Z n , CsZn ) 中的电荷排序模式
DOI：
10.1103/physrevb.62.9378
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发表时间：
2000
影响因子：
3.7
通讯作者：
Shōji Tanaka
中科院分区：
文献类型：
--
作者：
H. Tajima;S. Kyoden;H. Mori;Shōji Tanaka
测量了$\ensuremath{\theta}\ensuremath{-}{\mathrm{ET}}_{2}{\mathrm{MM}}^{\ensuremath{'}}{(\mathrm{SCN})}_{4}$（简称$\ensuremath{\theta}{\ensuremath{-}MM}^{\ensuremath{'}};$${\mathrm{MM}}^{\ensuremath{'}}=\mathrm{RbCo},$ RbZn和CsZn）单晶偏振反射光谱的温度依赖性。\ensuremath{\theta} -RbCo和\ensuremath{\theta} -RbZn盐的反射光谱在190 K左右缓慢冷却时变化剧烈$(dT/dt\ensuremath{\sim}\ensuremath{-}0.1\mathrm{K}/\mathrm{m}\mathrm{i}\mathrm{n}).$快速冷却时这种变化消失$(dT/dt\ensuremath{\sim}\ensuremath{-}1\mathrm{K}/\mathrm{m}\mathrm{i}\mathrm{n}).$\ensuremath{\theta} -CsZn盐的反射光谱在20 K以下表现为类drude特征。利用平均场计算，从光谱分析中推导出这些盐的电荷有序模式。
Temperature dependence of the polarized reflectance spectra have been measured on single crystals of $\ensuremath{\theta}\ensuremath{-}{\mathrm{ET}}_{2}{\mathrm{MM}}^{\ensuremath{'}}{(\mathrm{SCN})}_{4}$ (abbreviated as $\ensuremath{\theta}{\ensuremath{-}MM}^{\ensuremath{'}};$ ${\mathrm{MM}}^{\ensuremath{'}}=\mathrm{RbCo},$ RbZn, and CsZn). The reflectance spectra of the \ensuremath{\theta}-RbCo and \ensuremath{\theta}-RbZn salts exhibit drastic change around 190 K for the samples cooled slowly $(dT/dt\ensuremath{\sim}\ensuremath{-}0.1\mathrm{K}/\mathrm{m}\mathrm{i}\mathrm{n}).$ This spectral change disappears for the samples cooled rapidly $(dT/dt\ensuremath{\sim}\ensuremath{-}1\mathrm{K}/\mathrm{m}\mathrm{i}\mathrm{n}).$ The reflectance spectra of the \ensuremath{\theta}-CsZn salt exhibit Drude-like features down to 20 K. Charge-ordering patterns on these salts are deduced from the spectral analysis using the mean-field calculations.