热电材料Sr_{1-x} Rh_{2} O_{4}中d-p再杂化产生氧空穴的证据
Evidence for Oxygen Holes due to d-p Rehybridization in Thermoelectric Sr_{1-x}Rh_{2}O_{4}
摘要：
利用软X射线光电子能谱和吸收光谱研究了Sr_{1-x} Rh_{2} O_{4}的电子结构。类似于层状钴酸盐，如Na_{1-x} CoO_{2}，价带卫星功能（VBS）出现在较高的结合能的O 2 p带。我们发现，VBS共振在O 1的边缘。此外，核心吸收显示出明确的x依赖于O 1 s边缘，而不是在Rh 3 p边缘。这些结果表明，初始态的空穴主要具有O2 p特征，这可能是由于Sr^{2+}空位势对d-p再杂化的影响.由此产生的不均匀电荷织构可能对低x下的TE输运性质具有影响。
英文摘要：
Soft-x-ray photoemission and absorption spectroscopies are employed to investigate the electronic structures of Sr_{1-x}Rh_{2}O_{4}. Similarly to the layered cobaltates such as Na_{1-x}CoO_{2}, a valence-band satellite feature (VBS) occurs at higher binding energy to the O 2p band. We find that the VBS resonates at the O 1s edge. Additionally, core absorption shows clear x dependence in the O 1s edge rather than in the Rh 3p edge. These results indicate that the holes in the initial state mainly have O 2p character presumably due to d-p rehybridizations affected by Sr^{2+} vacancy potentials. The resultant inhomogenous charge texture may have impact on the TE transport properties at low x.
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