Dynamical valence fluctuation at the charge-density-wave phase boundary in iodide-bridged Pt compound [Pt(chxn)2I]I2 |
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| Authors: | Takaishi Shinya Kawakami Daisuke Yamashita Masahiro Sasaki Mari Kajiwara Takashi Miyasaka Hitoshi Sugiura Ken-Ichi Wakabayashi Yusuke Sawa Hiroshi Matsuzaki Hiroyuki Kishida Hideo Okamoto Hiroshi Watanabe Harutaka Tanaka Hisaaki Marumoto Kazuhiro Ito Hiroshi Kuroda Shin-Ichi |
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| Affiliation: | Department of Chemistry, Graduate School of Science, Tohoku University and CREST (JST), 6-3 Aza-aoba, Aramaki, Sendai 980-8578, Japan. takaishi@agnus.chem.tohoku.ac.jp |
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| Abstract: | We synthesized a novel iodo-bridged linear chain platinum compound, having the quasi-two-dimensional charge-density-wave (CDW) ground state and the smallest band gap. In this compound, we discovered an anomalous valence state in the boundary region at which the CDW phase alternates in the crystal by means of ESR, X-ray diffuse scattering, STM, and electrical resistivity. This anomalous state can be explained by the fast fluctuation between Pt(IV)-I...Pt(II) and Pt(II)...I-Pt(IV) in the double well potential. This is the first observation of the dynamical fluctuation of the CDW phase among the quasi one-dimensional halogen-bridged complexes. |
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