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 Citation (Scopus)

Abstract

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
Volume99
Issue number23
DOIs
StatePublished - Jun 3 2019

Fingerprint

Lattice vibrations
crystal field theory
Crystals
excitation
Fermions
Electron transitions
Heavy Metals
Ground state
Raman scattering
fermions
fine structure
Spectroscopy
Polarization
Raman spectra
magnetic permeability
ground state
Electrons
symmetry
polarization
Metals

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Lattice dynamics, crystal-field excitations, and quadrupolar fluctuations of YbRu2Ge2",
abstract = "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.",
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Lattice dynamics, crystal-field excitations, and quadrupolar fluctuations of YbRu2Ge2. / Ye, Mai; Rosenberg, E. W.; Fisher, I. R.; Blumberg, G.

In: Physical Review B, Vol. 99, No. 23, 235104, 03.06.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Lattice dynamics, crystal-field excitations, and quadrupolar fluctuations of YbRu2Ge2

AU - Ye, Mai

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AU - Fisher, I. R.

AU - Blumberg, G.

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AB - 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.

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