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.
|Physical Review B - Condensed Matter and Materials Physics
|Published - 2005 Dec 15
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics