Exchange interaction effects on the optical properties of LuMnO3

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

doi:10.1103/PhysRevLett.91.027203

Exchange interaction effects on the optical properties of LuMnO3

Strongly Correlated Electrons 2009-11-07 v2

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

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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 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.

Keywords

optical conductivity exchange interaction superexchange spin-phonon coupling dielectric constant

Cite

@article{arxiv.cond-mat/0212644,
  title  = {Exchange interaction effects on the optical properties of LuMnO3},
  author = {A. B. Souchkov and J. R. Simpson and H. D. Drew and M. Quijada and H. Ishibashi and N. Hur and J. S. Ahn and S. W. Cheong and A. J. Millis},
  journal= {arXiv preprint arXiv:cond-mat/0212644},
  year   = {2009}
}

Comments

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

Exchange interaction effects on the optical properties of LuMnO3

Abstract

Keywords

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