ELECTRON-SPECTROSCOPY STUDY OF THE SEMICONDUCTOR-METAL TRANSITION IN LA1-XSRXCOO3

被引：282

作者：

CHAINANI, A

MATHEW, M

SARMA, DD

机构：

[1] Solid State and Structural Chemistry Unit, Indian Institute of Science

来源：

PHYSICAL REVIEW B | 1992年 / 46卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.46.9976

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A study of the semiconductor-metal transition in the series La1-xSrxCoO3, x = 0.0-0.4, using electron-spectroscopy techniques is presented. The results show that the ground state of LaCoO3 has strongly mixed character. From the experiments we estimate the on-site Coulomb correlation energies U(dd) and U(pp) to be 3.4 and 6.7 eV, respectively, while the (pd(sigma)) interaction strength is 2.2 eV. A comparison of the experiment with the results of a model many-body cluster calculation for the Co 2p spectra indicates a low-spin state of Co in LaCoO3. The band gap of LaCoO3 is estimated to be about 0.6 eV from ultraviolet photoemission spectroscopy and bremsstrahlung isochromat spectroscopy measurements. The semiconductor-metal transition results from overlap of doped hole states with the valence band for x greater-than-or-equal-to 0.2.

引用

页码：9976 / 9983

页数：8

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