Optical probe of orbital ordering in heavily hole-doped manganites Nd 1 − x Sr x MnO 3 ( x = 0.55 and 0.7)
Optical probe of orbital ordering in heavily hole-doped manganites Nd 1 − x Sr x MnO 3 ( x = 0.55 and 0.7)
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重空穴掺杂锰矿 Nd 1 − x Sr x MnO 3 ( x = 0.55 和 0.7) 中轨道排序的光学探针
DOI：
10.1103/physrevb.67.140402
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发表时间：
2003
影响因子：
3.7
通讯作者：
Y. Tokura
中科院分区：
文献类型：
--
作者：
K. Tobe;Tatsumi Kimura;Y. Tokura
用光谱方法研究了Nd 1 -xSrxMnO 3（x=0.55和0.7）中dx 2 -y2型和d3 z2-r2型轨道的轨道有序态.无孪晶晶体的光学电导率谱相对于平行和垂直于轨道瓣方向的光偏振是高度各向异性的。极化谱的温度变化表明，所观察到的各向异性电荷动力学不仅来自长程自旋序，而且来自远高于Neel温度的400-600 K高温下演化的轨道序。
We have spectroscopically investigated the orbital-ordered states in Nd 1 - x Sr x MnO 3 (x=0.55 and 0.7) with the ferroic order of d x 2 - y 2-type and d 3 z 2 - r 2-type orbitals, respectively. The optical conductivity spectra of twin-free crystals are highly anisotropic with respect to light polarizations parallel and perpendicular to the direction of the orbital lobes. Temperature variation of the polarized spectra indicates that the observed anisotropic charge dynamics arises not only from the long-range spin order but also from the orbital order that evolves below a high temperature, 400-600 K, far above the Neel temperature.