Electron and orbital correlations in Ca2-xSrxRuO4 probed by optical spectroscopy.
Electron and orbital correlations in Ca2-xSrxRuO4 probed by optical spectroscopy.
复制标题
通过光谱探测 Ca2-xSrxRuO4 中的电子和轨道相关性。
DOI：
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发表时间：
2002
影响因子：
8.6
通讯作者：
Y. Maeno
中科院分区：
文献类型：
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作者：
J. S. Lee;Y. Lee;T. Noh;S. Oh;Jaejun Yu;S. Nakatsuji;H. Fukazawa;Y. Maeno
研究了准二维Ca2-xSrxRuO4（0.0<或=x<或=2.0）体系的电导率谱。在莫特绝缘态下，在大约1.0和1.9 eV处观察到两个电子关联引起的峰，这可以使用3轨道哈伯德模型来解释。随着温度降低，低频峰显示出向高频的转变，表明电子-声子相互作用在轨道排列中发挥着重要作用。通过系统分析，表明反铁轨道和铁轨道有序态可以共存。
The optical conductivity spectra of the quasi-two-dimensional Ca2-xSrxRuO4 (0.0< or =x< or =2.0) system were investigated. In the Mott insulating state, two electron correlation-induced peaks were observed about 1.0 and 1.9 eV, which could be explained using the 3-orbital Hubbard model. The low frequency peak showed a shift toward higher frequency as temperature was lowered, indicating that electron-phonon interactions play an important role in the orbital arrangements. From the systematic analysis, it was suggested that the antiferro-orbital and the ferro-orbital ordering states could coexist.