Exchange Interaction Effects on the Optical Properties of [Formula presented]

A. B. Souchkov, J. R. Simpson, M. Quijada, H. Ishibashi, N. Hur, J. S. Ahn, S. W. Cheong, A. J. Millis, H. D. Drew

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We have measured the optical conductivity of single crystal [Formula presented] from 10 to [Formula presented] at temperatures between 4 and 300 K. A symmetry allowed on-site Mn [Formula presented] transition near 1.7 eV is observed to blueshift ([Formula presented]) 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 [Formula presented] below [Formula presented] is overwhelmingly dominated by the phonon contributions.

Original languageEnglish (US)
JournalPhysical review letters
Issue number2
StatePublished - Jul 10 2003

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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