Photoinduced valence transition in gold complexes Cs 2 Au 2 X 6 ( X = Cl and Br) probed by x-ray photoemission spectroscopy
Photoinduced valence transition in gold complexes Cs 2 Au 2 X 6 ( X = Cl and Br) probed by x-ray photoemission spectroscopy
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DOI：
10.1103/physrevb.72.235105
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发表时间：
2005-12
影响因子：
3.7
通讯作者：
J. Son;T. Mizokawa;J. Quilty;K. Takubo;K. Ikeda;N. Kojima
中科院分区：
文献类型：
--
作者：
J. Son;T. Mizokawa;J. Quilty;K. Takubo;K. Ikeda;N. Kojima
钙钛矿型金配合物在6.5GPa的高压下不仅表现出光诱导的价态跃迁，而且还表现出从混合价态到单价态的压力诱导的价态跃迁。由于光电子能谱允许直接观察固体表面的电子状态，因此它非常适合作为探针来识别由于表面的光致相变（PIPT）而引起的电子变化。利用光电子能谱，在真空条件下（0GPa），我们成功地观察到了α表面的光诱导价态跃迁。这一观察结果表明，PIPT在过渡金属化合物的表面，这还有待探索，可以不同于那些在散装，这表明新的可能性，开发光学器件使用PIPT在固体表面。
Perovskite-type gold complexis known to show a photoinduced valence transition as well as a pressure-induced valence transition from the mixed-valenceandstate to the single-valencestate 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 ofeven 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.