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

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

Research output: Contribution to journalArticle

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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
Externally publishedYes

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Photoelectron spectroscopy
Gold
photoelectric emission
gold
valence
X rays
spectroscopy
Phase transitions
x rays
solid surfaces
Transition metal compounds
Electronic states
Optical devices
metal compounds
Perovskite
electronics
Vacuum
transition metals
vacuum
probes

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Photoinduced valence transition in gold complexes Cs2Au2X6 (X=Cl and Br) probed by x-ray photoemission spectroscopy. / Son, J. Y.; Mizokawa, Takashi; Quilty, J. W.; Takubo, K.; Ikeda, K.; Kojima, N.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 72, No. 23, 235105, 15.12.2005.

Research output: Contribution to journalArticle

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