Micro-Raman study of orbiton-phonon coupling in YbVO3

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

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    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

    Keywords

    • micro-Raman
    • YbVO3
    • phonon
    • orbiton
    • phase transitions

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