Raman spectroscopy of $f$-electron metals: an example of CeB${}_6$

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${}_{1g}$, 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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Cited by in corpus (8)

• Octupolar order in d-orbital Mott insulators
• Critical theory of non-Fermi liquid fixed point in multipolar Kondo problem
• Hidden orders in spin-orbit entangled correlated insulators
• Crystal-field excitations and vibronic modes in triangular-lattice spin-liquid candidate TbInO${}_3$
• Strong electron-phonon coupling and enhanced phonon Grüneisen parameters in valence-fluctuating metal EuPd${}_2$Si${}_2$
• Local origin of the strong field-space anisotropy in the magnetic phase diagrams of Ce${}_{1-x}$La${}_x$B${}_6$ measured in a rotating magnetic field
• Charge fluctuations in the intermediate-valence ground state of SmCoIn${}_5$
• Pseudo-chiral phonon splitting from octupolar magnetic order