Exchange interaction effects on the optical properties of LuMnO3

Details Exchange interaction effects on the optical properties of LuMnO3 Exchange interaction effects on the optical properties of LuMnO3

2002-12-31

arxiv.org/abs/cond-mat/0212644v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, Phys. Rev. Lett. accepted

Scientific paper

10.1103/PhysRevLett.91.027203

We have measured the optical conductivity of single crystal LuMnO3 from 10 to 45000 cm-1 at temperatures between 4 and 300 K. A symmetry allowed on-site Mn $d$-$d$ transition near 1.7 eV is observed to blue shift (~0.1 eV) in the antiferromagnetic state due to Mn-Mn superexchange interactions. Similar anomalies are observed in the temperature dependence of the TO phonon frequencies which arise from spin-phonon interaction. We find that the known anomaly in temperature dependence of the quasi-static dielectric constant epsilon_0 below the T_N ~90 K is overwhelmingly dominated by the phonon contributions.

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