ELECTRONIC-STRUCTURE OF AND THE METAL-INSULATOR-TRANSITION IN LA1-XSRXCOO3-DELTA - A SOFT-X-RAY ABSORPTION STUDY

被引：24

作者：

SARMA, DD

CHAINANI, A

CIMINO, R

SEN, P

CARBONE, C

MATHEW, M

GUDAT, W

机构：

[1] IST NAZL FIS NUCL, LAB NATL FRASCATI, FRASCATI, ITALY

[2] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST FESTKORPERFORSCH, W-5170 JULICH 1, GERMANY

[3] BESSY GMBH, W-1000 BERLIN, GERMANY

来源：

EUROPHYSICS LETTERS | 1992年 / 19卷 / 06期

关键词：

D O I：

10.1209/0295-5075/19/6/012

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the soft-X-ray absorption spectra at the oxygen K-edge of La1-xSrxCoO3-delta (x = 0.0, 0.1, 0.2, 0.3 and 0.4) series with experimentally determined delta-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 greater-than-or-equal-to 0.2.

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页码：513 / 518

页数：6

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