Micro-Raman study of orbiton-phonon coupling in YbVO3

B. Roberge, S. Jandl*, A.A. Nugroho, T.T.M. Palstra

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

First‐order and multiphonon Raman active excitations are studied in YbVO3 as a function of temperature in the orthorhombic and monoclinic phases. Below T ≃ 170 K, a G‐type orbital ordering with a concomitant monoclinic transition occurs. They enhance the phonon polarizabilities, allowing the resolution of room‐temperature bands, and activate new excitations around 700 cm−1. Below T ∼ 65 K, the 700 cm−1 excitations disappear, indicating a C‐type orbital ordering and a return to the orthorhombic structure. The observed phonon combinations around 1400 cm−1 with a dominant Jahn‐Teller vibration at ∼690 cm−1 reflect a possible orbiton‐phonon coupling.
Original languageEnglish
Pages (from-to)127-130
JournalJournal of raman spectroscopy
Volume43
Issue number1
DOIs
Publication statusPublished - Jan 2012
Externally publishedYes

Keywords

  • Micro-Raman
  • YbVO3
  • Phonon
  • Orbiton
  • Phase transitions
  • n/a OA procedure

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