title: Effects of rare-earth size on the electronic  structure of La1−xLuxVO3.
abstract: The electronic structure of La(1-x)Lu(x)VO(3)(x = 0, 0.2, 0.6 and 1) single crystals has been investigated using soft x-ray absorption spectroscopy, soft x-ray emission spectroscopy, and resonant soft x-ray inelastic scattering to study the effects of rare-earth size. The x-ray absorption and emission spectra at the O K-edge present a progressive evolution with R-site cation, in agreement with local spin density approximation calculations. This evolution with R, together with the temperature dependence of the O K-edge spectra, is attributed to changes in the crystal structure of La(1-x)Lu(x)VO(3). The crystal-field dd. excitations probed by resonant inelastic x-ray scattering at the V L(3)-edge exhibit an increase in energy and enhanced intensity with the decrease of R-site ionic radius, which is mainly attributed to the increased tilting magnitude of the VO(6) octahedra. Upon cooling to ~95 K, the dd* excitations are prominently enhanced in relative Intensity, in agreement with the formation of the Jahn.Teller distortion int he orbital ordering phase. Additionally, the dd* transitions of the mixed compounds are noticeably suppressed with respect to those of the pure compounds, possibly owing to the formation of C-type orbital ordering induced by large R-site size variances.
authors.affiliation: Department of Physics, Boston University, Boston, MA 02215, USA. bchen727@bu.edu
authors.forename: B
authors.initials: B
authors.lastname: Chen
authors.forename: J
authors.initials: J
authors.lastname: Laverock
authors.forename: D
authors.initials: D
authors.lastname: Newby
authors.forename: J F
authors.initials: JF
authors.lastname: McNulty
authors.forename: K E
authors.initials: KE
authors.lastname: Smith
authors.forename: P-A
authors.initials: PA
authors.lastname: Glans
authors.forename: J-H
authors.initials: JH
authors.lastname: Guo
authors.forename: R-M
authors.initials: RM
authors.lastname: Qiao
authors.forename: W-L
authors.initials: WL
authors.lastname: Yang
authors.forename: M R
authors.initials: MR
authors.lastname: Lees
authors.forename: L D
authors.initials: LD
authors.lastname: Tung
authors.forename: R P
authors.initials: RP
authors.lastname: Singh
authors.forename: G
authors.initials: G
authors.lastname: Balakrishnan