Orbital excitations in titanates

C. Ulrich; A. Gössling; M. Grüninger; M. Guennou; H. Roth; M. Cwik; T. Lorenz; G. Khaliullin; B. Keimer

Orbital excitations in titanates

Strongly Correlated Electrons 2007-05-23 v1

Authors: C. Ulrich , A. Gössling , M. Grüninger , M. Guennou , H. Roth , M. Cwik , T. Lorenz , G. Khaliullin , B. Keimer

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Abstract

Raman scattering is used to observe pronounced electronic excitations around 230 meV - well above the two-phonon range - in the Mott insulators LaTiO $_3$ and YTiO $_3$ . Based on the temperature, polarization, and photon energy dependence, the modes are identified as orbital excitations. The observed profiles bear a striking resemblance to magnetic Raman modes in the insulating parent compounds of the superconducting cuprates, indicating an unanticipated universality of the electronic excitations in transition metal oxides.

Keywords

raman spectroscopy

Cite

@article{arxiv.cond-mat/0503106,
  title  = {Orbital excitations in titanates},
  author = {C. Ulrich and A. Gössling and M. Grüninger and M. Guennou and H. Roth and M. Cwik and T. Lorenz and G. Khaliullin and B. Keimer},
  journal= {arXiv preprint arXiv:cond-mat/0503106},
  year   = {2007}
}

Comments

4 pages, 4 figures

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