TY - JOUR
T1 - Photoinduced valence transition in gold complexes Cs2Au2X6 (X=Cl and Br) probed by x-ray photoemission spectroscopy
AU - Son, J. Y.
AU - Mizokawa, T.
AU - Quilty, J. W.
AU - Takubo, K.
AU - Ikeda, K.
AU - Kojima, N.
PY - 2005/12/15
Y1 - 2005/12/15
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.72.235105
DO - 10.1103/PhysRevB.72.235105
M3 - Article
AN - SCOPUS:29744471108
SN - 0163-1829
VL - 72
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 23
M1 - 235105
ER -