Raman spectroscopy of $f$-electron metals: an example of CeB$_{6}$

Mai Ye; H. -H. Kung; Priscila F. S. Rosa; Eric D. Bauer; Zachary Fisk; G. Blumberg

doi:10.1103/PhysRevMaterials.3.065003

paper

Raman spectroscopy of $f$ -electron metals: an example of CeB $_{6}$

arXiv:1902.09049 · doi:10.1103/PhysRevMaterials.3.065003

Abstract

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 $_{1 g}$ , E $_{g}$ , T $_{1 g}$ , and T $_{2 g}$ of the cubic O $_{h}$ point group. We demonstrate that for CeB $_{6}$ system only T $_{1 g}$ -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 $_{1 g}$ -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.

Raman spectroscopy of f-electron metals: an example of CeB6​

Abstract

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Raman spectroscopy of $f$ -electron metals: an example of CeB $_{6}$