Evidence for oxygen holes due to d-p rehybridization in thermoelectric Sr1-x Rh2 O4

Y. Ishida, T. Baba, Ritsuko Eguchi, M. Matsunami, M. Taguchi, A. Chainani, Y. Senba, H. Ohashi, Y. Okamoto, H. Takagi, S. Shin

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Abstract

Soft-x-ray photoemission and absorption spectroscopies are employed to investigate the electronic structures of Sr1-x Rh2 O4. Similar to the layered cobaltates such as Na1-x CoO2, a valence-band satellite feature (VBS) occurs at higher binding energy to the O2p band. We find that the VBS resonates at the O1s edge. Additionally, core absorption shows clear x dependence in the O1s edge rather than in the Rh3p edge. These results indicate that the holes in the initial state mainly have O2p character presumably due to d-p rehybridizations affected by Sr2+ vacancy potentials. The resultant inhomogeneous charge texture may have impact on the thermoelectric transport properties at low x.

Original languageEnglish
Article number081103
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number8
DOIs
Publication statusPublished - Aug 12 2009
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Ishida, Y., Baba, T., Eguchi, R., Matsunami, M., Taguchi, M., Chainani, A., Senba, Y., Ohashi, H., Okamoto, Y., Takagi, H., & Shin, S. (2009). Evidence for oxygen holes due to d-p rehybridization in thermoelectric Sr1-x Rh2 O4. Physical Review B - Condensed Matter and Materials Physics, 80(8), [081103]. https://doi.org/10.1103/PhysRevB.80.081103