Exchange interaction effects on the optical properties of LuMnO3 |
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| Authors: | Souchkov A B Simpson J R Quijada M Ishibashi H Hur N Ahn J S Cheong S W Millis A J Drew H D |
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| Institution: | Materials Research Science and Engineering Center, University of Maryland, College Park, Maryland 20742, USA. |
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| Abstract: | 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 blueshift ( approximately 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 the temperature dependence of the quasistatic dielectric constant epsilon(0) below T(N) approximately 90 K is overwhelmingly dominated by the phonon contributions. |
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