,Electronic Phase Diagram of Mixed-Valence Gold Chloride

• 作 者: LIU Xiao-Jun(刘晓峻) MORITOMO Yutaka(守友浩) KOJIMA Norimichi(小岛宪道)
• 机 构: Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093“,”Depa
• 出 处: 中国物理快报（英文版）
• 发表日期: 2004年1期

A comprehensive electronic phase diagram is derived for mixed-valence gold chloride Cs2Au2Cl6 by means of high-pressure Raman spectroscopy. At all the temperatures investigated (100 K≤ T≤ 300 K), applications of pressure induce a phase transition from the mixed-valence (MV) state to a single-valence (SV) state. In the SV state, a broad Au-Cl stretching band appears at ～ 400cm-1 below ～ 200 K. We have interpreted the appearance of the band in terms of formation of the AuX-2-like local lattice distortion, or the bipolarons.