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 journalLetter

25 Citations (Scopus)

Abstract

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
JournalEPL
Volume19
Issue number6
DOIs
Publication statusPublished - 1992 Jul 15

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insulators
electronic structure
oxygen
metals
x rays
rays
transition metals
charge transfer
absorption spectra

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Sarma, D. D. ; Chainani, A. ; Cimino, R. ; Sen, P. ; Carbone, C. ; Mathew, M. ; Gudat, W. / Electronic structure of and the metal-insulator transition in La1 – xSrxCoO3δ : A soft-X-ray absorption study. In: EPL. 1992 ; Vol. 19, No. 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, 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.",
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Electronic structure of and the metal-insulator transition in La1 – xSrxCoO3δ : A soft-X-ray absorption study. / Sarma, D. D.; Chainani, A.; Cimino, R.; Sen, P.; Carbone, C.; Mathew, M.; Gudat, W.

In: EPL, Vol. 19, No. 6, 15.07.1992, p. 513-518.

Research output: Contribution to journalLetter

TY - JOUR

T1 - Electronic structure of and the metal-insulator transition in La1 – xSrxCoO3–δ

T2 - A soft-X-ray absorption study

AU - Sarma, D. D.

AU - Chainani, A.

AU - Cimino, R.

AU - Sen, P.

AU - Carbone, C.

AU - Mathew, M.

AU - Gudat, W.

PY - 1992/7/15

Y1 - 1992/7/15

N2 - 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.

AB - 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.

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JO - Europhysics Letters

JF - Europhysics Letters

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