Raman scattering in the Mott insulators LaTiO3 and YTiO3: evidence for orbital excitations |
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| Authors: | Ulrich C Gössling A Grüninger M Guennou M Roth H Cwik M Lorenz T Khaliullin G Keimer B |
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| Affiliation: | Max-Planck-Institut für Festk?rperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. |
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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 LaTiO3 and YTiO3. 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. |
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