Raman scattering in the Mott insulators LaTiO3 and YTiO3: evidence for orbital excitations.
作者信息
Ulrich C, Gössling A, Grüninger M, Guennou M, Roth H, Cwik M, Lorenz T, Khaliullin G, Keimer B
机构信息
Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
出版信息
Phys Rev Lett. 2006 Oct 13;97(15):157401. doi: 10.1103/PhysRevLett.97.157401. Epub 2006 Oct 9.
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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