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Magnetic-order induced spectral-weight redistribution in La0.7 (Sr,Ca) 0.3 MnO3
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- Rauer, Ralf, 1974 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
- Rübhausen, M. (author)
- Dörr, K. (author)
- (creator_code:org_t)
- 2006
- 2006
- English.
- In: Physical Review B - Condensed Matter and Materials Physics. - 2469-9950 .- 2469-9969. ; 73:9, s. 1-4
- Journal article (peer-reviewed)
Abstract
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- We present the optical and magneto-optical characterization of La0.7 (Sr,Ca) 0.3 MnO3 at temperatures 25 K≤T≤470 K. The metal-insulator transition is accompanied by a magnetic-order induced spectral-weight redistribution within 0.5-5.5 eV. Relating the kinetic energy of superexchange and double-exchange models to the optical spectral weight allows the distinction of Mn intersite from O2p→Mn3d charge-transfer excitations. We infer that with decreasing temperature, the lower Hubbard band approaches the in-gap states by a reduction of the Jahn-Teller energy causing the metal-insulator transition. We estimate ΔJT ≈0.8 eV, JH >0.8 eV, U>2.9 eV, and Δ≤2.2 eV.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Annan teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies (hsv//eng)
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