Electronic structure of and the metal-insulator transition in La1 – xSrxCoO3δ: A soft-X-ray absorption study

D. D. Sarma, A. Chainani, R. Cimino, P. Sen, C. Carbone, M. Mathew, W. Gudat

Research output: Contribution to journalLetterpeer-review

25 Citations (Scopus)


We report the soft–X-ray absorption spectra at the oxygen K-edge of La1 – xSrxCoO3 – δ(x = 0.0, 0.1, 02, 0.3 and 0.4) series with experimentally determined δ values. We show that the doping of holes by replacing La3+with Sr2+induces states within the band gap of the insulating undoped compound for small x and these doped states have a very substantial oxygen 2p character. This indicates that the insulating compounds belong to the charge transfer insulator regime. With increasing Sr content, the doped states broaden into a band overlapping the top of the primarily oxygen p-derived band, leading to an insulator-metal transition at x ³ 0.2.

Original languageEnglish
Pages (from-to)513-518
Number of pages6
Issue number6
Publication statusPublished - 1992 Jul 15

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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