Photoinduced valence transition in gold complexes Cs2Au2X6 (X=Cl and Br) probed by x-ray photoemission spectroscopy

J. Y. Son, T. Mizokawa, J. W. Quilty, K. Takubo, K. Ikeda, N. Kojima

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15 Citations (Scopus)

Abstract

Perovskite-type gold complex Cs2Au2Br6 is known to show a photoinduced valence transition as well as a pressure-induced valence transition from the mixed-valence Au+ and Au3+ state to the single-valence Au2+ state under high pressure of 6.5 GPa. Since photoemission spectroscopy permits direct observation of electronic states at the solid surface, it is well suited as a probe to identify electronic changes due to photoinduced phase transitions (PIPT) at the surface. By means of photoemission spectroscopy, we have succeeded to observe the photoinduced valence transition at a surface of Cs2Au2Br6 even under vacuum conditions (0 GPa). This observation shows that PIPT at the surface of transition-metal compounds, which have yet to be explored, can be different from those in the bulk, suggesting new possibilities to develop optical devices using PIPT at a solid surface.

Original languageEnglish
Article number235105
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number23
DOIs
Publication statusPublished - 2005 Dec 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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