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Electronic Phase Diagram of Mixed-Valence Gold Chloride |
| LIU Xiao-Jun1,2;MORITOMO Yutaka2;KOJIMA Norimichi3 |
| 1Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093
2Department of Applied Physics, Nagoya University, Nagoya 464-8601, Japan
3Department of Pure and Applied Sciences, University of Tokyo, Tokyo 153-8902, Japan |
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| Cite this article: |
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LIU Xiao-Jun, MORITOMO Yutaka, KOJIMA Norimichi 2004 Chin. Phys. Lett. 21 183-186 |
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Abstract 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.
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| Keywords:
74.62.Fj
71.30.Th
78.30.-j
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Published: 01 January 2004
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