title: Raman scattering study of β-Sr(0.33)V(2)O(5) in charge disordered and ordered phase.
abstract: Polarized Raman spectra of the strontium vanadium oxide bronze β-Sr(0.33)V(2)O(5) are measured in the temperature range between 300 and 77 K. The charge ordering phase transition at about 165 K is characterized by the appearance of new Raman-active modes in the spectra, as well as through an abrupt change of the phonon frequencies and dampings. The Raman scattering spectra of β-Sr(0.33)V(2)O(5) in the charge disordered phase are in apparent resemblance with those of α'-NaV(2)O(5), which suggests that there is a similar charge-phonon dynamics in both compounds. We also suggest that the electrons are delocalized into V(1)-O(5)-V(3) orbitals in the mixed valence state of β-Sr(0.33)V(2)O(5).
authors.affiliation: Center for Solid State Physics and New Materials, Institute of Physics, Pregrevica 118, 11080 Belgrade, Serbia.
authors.forename: Z V
authors.initials: ZV
authors.lastname: Popović
authors.forename: A G
authors.initials: AG
authors.lastname: Kontos
authors.forename: Y S
authors.initials: YS
authors.lastname: Raptis
authors.forename: M
authors.initials: M
authors.lastname: Isobe
authors.forename: Y
authors.initials: Y
authors.lastname: Ueda