2018年2月15日
Observation of a Pseudogap in the Vicinity of the Metal–Insulator Transition in the Perovskite-type Vanadium Oxides Nd1−xSrxVO3
Journal of the Physical Society of Japan
- 巻
- 87
- 号
- 2
- 開始ページ
- 024708
- 終了ページ
- 024708
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.7566/jpsj.87.024708
- 出版者・発行元
- Physical Society of Japan
We have performed a photoemission study of the Mott–Hubbard system Nd1−xSrxVO3 (x = 0.20 and 0.30) to investigate the electronic structure in the vicinity of the metal–insulator transition. By using bulk sensitive hard X-ray photoemission spectroscopy, we have observed a large coherent spectral weight near the Fermi level compared to those observed with surface-sensitive low photons. In particular, a pseudogap with an energy of ~0.2 eV has been observed near the Fermi level, which is consistent with a prediction with a dynamical cluster approximation calculation. In order to understand the characteristic features in the Mott–Hubbard-type metal–insulator transition, particularly the pseudogap opening at x = 0.2 and 0.3, a phenomenological model of the self-energy has been proposed.
- リンク情報
- ID情報
-
- DOI : 10.7566/jpsj.87.024708
- ISSN : 0031-9015
- eISSN : 1347-4073
- ORCIDのPut Code : 78934817
- SCOPUS ID : 85040764310