Lattice dynamics, crystal-field excitations, and quadrupolar fluctuations of YbRu2Ge2

Mai Ye, E. W. Rosenberg, I. R. Fisher, G. Blumberg

Research output: Contribution to journalArticle

1 Scopus citations


We employ polarization-resolved Raman scattering spectroscopy to study ferroquadrupolar (FQ) fluctuations and crystal-field (CF) excitations in the YbRu2Ge2 heavy-fermion metal with FQ transition at TQ=10K. We demonstrate that the electronic static Raman susceptibilities in quadrupolar symmetry channels exhibit nearly Curie law behavior and that the electron-lattice coupling is essential for the FQ transition at TQ. We establish the CF level scheme of the Yb3+ ground state F7/22 multiplet. We study the lattice dynamics and demonstrate coupling between CF transitions and phonon modes.

Original languageEnglish (US)
Article number235104
JournalPhysical Review B
Issue number23
StatePublished - Jun 3 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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