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Numrering	Referens	Omslagsbild	Hitta
1.	Rauer, Ralf, 1974, et al. (författare) Magnetic-order induced spectral-weight redistribution in La0.7 (Sr,Ca) 0.3 MnO3 2006 Ingår i: Physical Review B - Condensed Matter and Materials Physics. - 2469-9950 .- 2469-9969. ; 73:9, s. 1-4 Tidskriftsartikel (refereegranskat)abstract 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.

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