Electronic structure of and the metal-insulator transition in La1−xSrxCoO3−δ: a soft-X-ray absorption study

Sarma, D. D. ; Chainani, A. ; Cimino, R. ; Sen, P. ; Carbone, C. ; Mathew, M. ; Gudat, W. (1992) Electronic structure of and the metal-insulator transition in La1−xSrxCoO3−δ: a soft-X-ray absorption study EPL: Europhysics Letters, 19 (6). 513 -513. ISSN 0295-5075

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Official URL: http://iopscience.iop.org/0295-5075/19/6/012

Related URL: http://dx.doi.org/10.1209/0295-5075/19/6/012

Abstract

We report the soft-X-ray absorption spectra at the oxygen K-edge of La1−xSrxCoO3−δ (x=0.0, 0.1, 0.2, 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≥0.2.

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