Electronic Structure of and the Metal-Insulator Transition in La1-xSrxCoO3-δ: A Soft-X-Ray Absorption Study

Sarma, DD and Chainani, A and Cimino, R and Sen, P and Mathew, M and Gudat, W (1992) Electronic Structure of and the Metal-Insulator Transition in La1-xSrxCoO3-δ: A Soft-X-Ray Absorption Study. In: EPL: Europhysics Letters, 19 (6). pp. 513-518.

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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.

Item Type:	Journal Article
Additional Information:	Copyright of this article belongs to EDP sciences.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	24 Jan 2011 09:41
Last Modified:	24 Jan 2011 09:41
URI:	http://eprints.iisc.ernet.in/id/eprint/35214

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