Orbital degrees of freedom and electron correlation in optical absorption of metallic LaSrMnO |
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Authors: | A. Takahashi H. Shiba |
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Affiliation: | (1) Department of Physics, Tokyo Institute of Technology, Oh-okayama, Tokyo 152, Japan, JP |
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Abstract: | The optical absorption in ferromagnetic metal La1-xSrxMnO3 is anomalous; it has a wide-range absorption up to about 1 eV even at zero temperature. Since 3d electrons in La1-xSrxMnO3 partially fill doubly degenerate eg orbitals, the orbital degrees of freedom are crucial to understand this metallic system. We argue that the interband transition within eg orbitals is important in the optical absorption. The optical spectrum is modified also by the inter-orbital Coulomb interaction. We have examined perturbatively the effect of the Coulomb interaction on the spectrum. Available experiments are discussed by comparing with the present results. Received: 13 February 1998 / Accepted: 17 March 1998 |
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Keywords: | PACS. 71.27.+a Strongly correlated electron systems heavy fermions - 71.30.+h Metal insulator transitions and other electronic transitions - 78.20.-e Optical properties of bulk materials and thin films |
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