Photo-control of charge and orbital states in transition-metal compounds porobed by photoemission spectroscopy

K. Takubo*, J. Y. Son, T. Mizokawa, N. Takubo, K. Miyano, N. Matsumoto, S. Nagata

*この研究の対応する著者

研究成果: Article査読

抄録

We have studied the charge-orbital states in spinel- type CuIr 2S 4 and perovskite-type Pr 0.55(Ca 1-y Sr y ) 0.45MnO 3 (PCSMO, y=0.25, 0.40) using X-ray photoemission spectroscopy (XPS) combined with laser illumination. The XPS data of CuIr 2S 4 are dramatically changed by the insulator-metal transition (IMT). The line shape of CuIr 2S 4 in the insulating phase is consistent with the charge disproportionation of Ir 3+:Ir 4+=1:1. Interestingly, a visible light irradiation at low temperature gives a resistance reduction but does not give any spectral change. In case of PCSMO, the IMT is also clearly observed on the XPS data and the peculiar temperature dependence for y=0.25 suggests the coexisting of the ferromagnetic metallic phase and the charge-orbital ordered insulating phase. The spectra after visible light illumination show the enhancement of the density of states at the Fermi level, accompanied with the drop of the resistance.

本文言語English
ページ(範囲)635-638
ページ数4
ジャーナルJournal of Superconductivity and Novel Magnetism
20
7-8
DOI
出版ステータスPublished - 2007 11 1
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

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