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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U2 - 10.1209/0295-5075/19/6/012
DO - 10.1209/0295-5075/19/6/012
M3 - Letter
AN - SCOPUS:84956238310
SN - 0295-5075
VL - 19
SP - 513
EP - 518
JO - EPL
JF - EPL
IS - 6
ER -