Chainani, A. ; Mathew, M. ; Sarma, D. D. (1992) Electron-spectroscopy study of the semiconductor-metal transition in La1−xSrxCoO3 Physical Review B: Condensed Matter and Materials Physics, 46 (16). pp. 9976-9983. ISSN 1098-0121
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Official URL: http://prb.aps.org/abstract/PRB/v46/i16/p9976_1
Related URL: http://dx.doi.org/10.1103/PhysRevB.46.9976
Abstract
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 Udd and Upp to be 3.4 and 6.7 eV, respectively, while the (pdσ) 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≥0.2.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The American Physical Society. |
| ID Code: | 46218 |
| Deposited On: | 02 Jul 2011 13:53 |
| Last Modified: | 02 Jul 2011 13:53 |
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