Effects of rare-earth size on the electronic structure of La1-xLuxVO3

B. Chen, J. Laverock, D. Newby, J. F. McNulty, K. E. Smith, P. A. Glans, J. H. Guo, R. M. Qiao, W. L. Yang, M. R. Lees, L. D. Tung, R. P. Singh, G. Balakrishnan

Research output: Contribution to journalArticle (Academic Journal)

8 Citations (Scopus)

Abstract

The electronic structure of La1-xLuxVO3(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 La1-xLuxVO3. The crystal-field dd excitations probed by resonant inelastic x-ray scattering at the V L3-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 VO6 octahedra. Upon cooling to ∼95K, the dd excitations are prominently enhanced in relative intensity, in agreement with the formation of the Jahn-Teller distortion in the 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.

Original languageEnglish
Article number105503
JournalJournal of Physics Condensed Matter
Volume27
Issue number10
DOIs
Publication statusPublished - 18 Mar 2015

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