Orbital character of the conduction band of delafossitePdCoO2studied by polarization-dependent soft x-ray absorption spectroscopy
| Autor: | Kyoung Ja Park, B. I. Min, Hojin Sung, Han-Jin Noh, Sung Baek Kim, Hyeong-Do Kim, Jae Young Kim, Kyoo Kim, Jinwon Jeong, Jinhwan Jeong |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Physical Review B. 80 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.80.073104 |
| Popis: | We present the x-ray absorption spectra that show the Co valence state and the orbital character of the conduction band of delafossite ${\text{PdCoO}}_{2}$. The $\text{Co}\text{ }2p$ x-ray absorption spectra of ${\text{PdCoO}}_{2}$ and ${\text{PtCoO}}_{2}$ show that the Co ions have the trivalent low-spin configuration. The polarization-dependent $\text{O}\text{ }1s$ absorption spectra reveal that the unoccupied density of states (DOS) near the Fermi level consists mainly of the $\text{Pd}\text{ }4{d}_{3{z}^{2}\ensuremath{-}{r}^{2}}$ states. The experimental $\text{O}\text{ }2{p}_{z}$ partial DOS (PDOS) is extracted from the polarization-dependent $\text{O}\text{ }1s$ spectra and is compared with the theoretical PDOS by the local-density approximation, showing a good agreement. These observations provide a consistent picture on the origin of the good conductivity of the delafossite oxides. |
| Databáze: | OpenAIRE |
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