Co K-edge XANES and spin-state transition of RCoO3 (R = La, Eu)

J. Y. Chang, B. N. Lin, Y. Y. Hsu, H. C. Ku

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Co K-edge X-ray absorption near-edge spectra at 300 K and magnetic studies for the rhombohedral LaCoO3 with low-spin state to intermediate-spin (IS) state transition Ts≃105 K and orthorhombic EuCoO 3 (Ts≃295 K) are reported. The small pre-edge feature observed is from 1s-3d dipole transition, which is weakly allowed through the hybridization of Co 4p states with 3d states of neighboring Co atoms. For both samples in the IS state, pre-edge can be fitted using three peaks with energy separation P2 - P1 = 2.0 eV for R = La and Eu, and P3 - P2 = 1.5 eV for R = La and 1.3 eV for R = Eu. Since the thermally excited IS state is a mixed t2g 5eg 1 and d7L (t2g 6eg 1 or t2g 5e g 2), with almost filled t2g↑ states. From reported band structure calculation, the three peaks P1, P 2, P3 are probably corresponding to the unfilled t 2g↓, eg↑ and eg↓ states, respectively.

Original languageEnglish
Pages (from-to)826-828
Number of pages3
JournalPhysica B: Condensed Matter
Volume329-333
Issue numberII
DOIs
Publication statusPublished - 2003 Jan 1

Keywords

  • Spin-state transition
  • XANES

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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