Low-temperature Raman spectra of YbVO4
VIBRATIONAL SPECTROSCOPY, 45 (2, SI):
95-98 (2007)Workshop on Foundations and Applications of Raman Spectroscopy, Ceara,
BRAZIL, SEP 24-26, 2006.DOI: 10.1016/j.vibspec.2007.05.002
Zusammenfassung
This paper reports on the spectroscopic study of YbVO4 in the range
10-300 K. 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 Gamma(6) and Gamma(7) with an E-g(3)
phonon at room-temperature occurs. A possible explanation for the
absence of electron-phonon coupling in YbVO4 is the occurrence of the
Gamma(6) state at energy higher than the E-g(3) phonon, unlike the
coincidence of Gamma(6) and E-g(3) energies in YbPO4. (c) 2007 Elsevier
B.V. All rights reserved.