$f$电子金属的拉曼光谱：CeB $_{6}$的一个例子
Raman spectroscopy of $f$-electron metals: an example of CeB$_{6}$
摘要：
本文应用于$_{6}$重费米子金属，对一个单电子准定域在高对称晶体学位离子f壳层的稀土体系的电磁激发进行了光谱学研究。我们进行了群论分类的电子晶体场（CF）的过渡和评估他们的耦合光截面偏振分辨拉曼散射过程。讨论了对称化喇曼磁化率在研究f-电子系统中的奇异电荷和自旋高多重态有序相方面的适用性。我们研究了温度对多重态内和多重态间CF跃迁以及CF激发与晶格振动之间的耦合的影响。我们获得了低频偏振分辨拉曼响应的温度依赖性，并获得了所有拉曼允许对称通道的静态拉曼极化率：立方O $_{h}$点群的A $_{1g}$，E $_{g}$，T $_{1g}$和T $_{2g}$。我们证明，对于CeB $_{6}$系统只有T $_{1g}$对称的静态拉曼磁化率显示出异常的温度依赖性，这是与其他技术测量的磁化率数据一致。T $_{1g}$通道中的这种异常行为表明存在长波长的磁波动，而所有其余对称通道的磁化率增强的缺乏表明在低温下长波长的电荷四极子波动是弱的。
英文摘要：
We performed an optical spectroscopy study of electronic and magnetic excitations for a rare-earth system with a single electron quasi-localized in the f-shell on an ion at high-symmetry crystallographic site in application to CeB$_{6}$ heavy-fermion metal. We carried out group-theoretical classification of the electronic crystal field (CF) transitions and assessed their coupling to light cross-sections for polarization resolved Raman scattering processes. We discuss applicability of symmetrized Raman susceptibility to studies of exotic charge and spin high multiplet ordering phases in f-electron systems. We study temperature effects on intra- and inter-multiplet CF transitions and also on the coupling between the CF excitations with the lattice vibrations. We acquired temperature dependence of the low-frequency polarization resolved Raman response and obtained the static Raman susceptibility for all Raman-allowed symmetry channels: A$_{1g}$, E$_{g}$, T$_{1g}$, and T$_{2g}$ of the cubic O$_{h}$ point group. We demonstrate that for CeB$_{6}$ system only T$_{1g}$-symmetry static Raman susceptibility shows an anomalous temperature dependence which is consistent with the magnetic susceptibility data measured by other techniques. This anomalous behavior in the T$_{1g}$-channel signifies the presence of long wavelength magnetic fluctuations, while the lack of susceptibility enhancement for all the remaining symmetry channels indicates that long wavelength charge quadrupole fluctuations at low-temperature are weak.
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