Anomalous orbital dynamics in LaSrMnO4 observed by Raman spectroscopy
Anomalous orbital dynamics in LaSrMnO4 observed by Raman spectroscopy
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DOI：
10.1103/physrevb.77.064415
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发表时间：
2008-02
影响因子：
3.7
通讯作者：
K. Choi;P. Lemmens;D. Heydhausen;G. Güntherodt;C. Baumann;R. Klingeler;P. Reutler;B. Büchner
中科院分区：
文献类型：
--
作者：
K. Choi;P. Lemmens;D. Heydhausen;G. Güntherodt;C. Baumann;R. Klingeler;P. Reutler;B. Büchner
本文报道了单层锰矿的非弹性光散射实验。观察到的明显特征是大量对称禁止声子峰的出现，其强度和频率具有很强的温度依赖性，以及激活的高频平面内模式的双峰结构。这些观测结果归因于存在于晶体场稳定轨道背景中的混合轨道的明显动力学。我们的研究表明，由于轨道倾斜而产生的动能增益与强晶体场分裂之间存在显著的竞争。
We report inelastic light scattering experiments on the single-layered manganite. The distinct features observed are the appearance of numerous symmetry-forbidden phonon peaks, with a strong temperature dependence of their intensity and frequency, and a double-peak structure of the activated high-frequency in-plane modes. These observations are ascribed to the conspicuous dynamics of an admixedorbital present in the background of the crystal field stabilizedorbitals. Our study suggests a significant competition between the kinetic energy gain due to the resulting orbital canting and the strong crystal field splitting.