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Magnetic-order induced spectral-weight redistribution in La0.7 (Sr,Ca) 0.3 MnO3

Ralf Rauer (Institutionen för teknisk fysik, Kondenserade materiens elektronstruktur) ; M. Rübhausen ; K. Dörr
Physical Review B - Condensed Matter and Materials Physics (10980121 ). Vol. 73 (2006), 9, p. 1-4.
[Artikel, refereegranskad vetenskaplig]

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.

Denna post skapades 2009-12-07.
CPL Pubid: 102922


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens elektronstruktur (2005-2006)


Teknisk fysik

Chalmers infrastruktur