Raman scattering in the mott insulators LaTiO3 and YTiO3:: Evidence for orbital excitations

被引：54
|
作者：
Ulrich, C.
Goessling, A.
Grueninger, M.
Guennou, M.
Roth, H.
Cwik, M.
Lorenz, T.
Khaliullin, G.
Keimer, B.
机构：
[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
[2] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany
来源：
PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 15期
关键词：
D O I：
10.1103/PhysRevLett.97.157401
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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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页数：4
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