Low-temperature Raman spectra of YbVO4

This paper reports on the spectroscopic study of YbVO4 in the range 10-300K. All the Raman phonons were properly assigned. Temperature-dependent Raman spectra showed no anomalous changes, which indicate that neither structural phase transition nor strong electron-phonon coupling occur, at least with...

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Bibliographic Details
Published in:Vibrational spectroscopy 2007-11, Vol.45 (2), p.95-98
Main Authors: Santos, C.C., Guedes, I., Loong, C.-K., Boatner, L.A.
Format: Article
Language:English
Subjects:
CRYSTAL FIELD
ELECTRON-PHONON COUPLING
PHONONS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
RAMAN SPECTRA
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Summary:This paper reports on the spectroscopic study of YbVO4 in the range 10-300K. All the Raman phonons were properly assigned. Temperature-dependent Raman spectra showed no anomalous changes, which indicate that neither structural phase transition nor strong electron-phonon coupling occur, at least within this temperature range. This result is sharp contrast to those of YbPO4 where strong mixing of the upper crystal-field states Gamma6 and Gamma7 with an phonon at room-temperature occurs. A possible explanation for the absence of electron-phonon coupling in YbVO4 is the occurrence of the Gamma6 state at energy higher than the phonon, unlike the coincidence of Gamma6 and energies in YbPO4.
ISSN:0924-2031
1873-3697
DOI:10.1016/j.vibspec.2007.05.002