抄録
We have studied the electronic structure and its changes across the metal-insulator transition in the spinel-type compound (Formula presented)(Formula presented) using photoemission and inverse-photoemission spectroscopy. Photoemission spectra near the Fermi level show a gap opening of ∼20 meV in the insulating phase, consistent with the transport activation energy. Core-level spectra indicate that the Cu ion is monovalent, and hence Ir is in the intermediate valence state of +3.5. Comparison between the spectra and band-structure calculation reveals that the Ir 5d density of states is strongly distorted, probably due to electron correlation in spite of the general belief of weak correlation in 5d-electron systems.
本文言語 | English |
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ページ(範囲) | R15979-R15982 |
ジャーナル | Physical Review B - Condensed Matter and Materials Physics |
巻 | 55 |
号 | 24 |
DOI | |
出版ステータス | Published - 1997 |
外部発表 | はい |
ASJC Scopus subject areas
- 電子材料、光学材料、および磁性材料
- 凝縮系物理学