Spin-controlled Mott-Hubbard bands in LaMnO_3 probed by optical ellipsometry

Details Spin-controlled Mott-Hubbard bands in LaMnO_3 probed by optical ellipsometry Spin-controlled Mott-Hubbard bands in LaMnO_3 probed by optical ellipsometry

2004-05-21

arxiv.org/abs/cond-mat/0405509v2

Phys. Rev. Lett. 93, 147204 (2004).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.93.147204

Spectral ellipsometry has been used to determine the dielectric function of an untwinned crystal of LaMnO_3 in the spectral range 0.5-5.6 eV at temperatures 50 K < T < 300 K. A pronounced redistribution of spectral weight is found at the Neel temperature T_N = 140 K. The anisotropy of the spectral weight transfer matches the magnetic ordering pattern. A superexchange model quantitatively describes spectral weight transfer induced by spin correlations. This analysis implies that the lowest-energy transitions around 2 eV are intersite d-d transitions, and that LaMnO_3 is a Mott-Hubbard insulator.

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