Temperature- and Pressure-Induced Charge-Density-Wave to Mott--Hubbard Phase Transitions in Quasi-One-Dimensional Bromine-Bridged Pd Compounds
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概要
- 論文の詳細を見る
Temperature- and pressure-induced transitions from the charge-density-wave (CDW) phase to the Mott--Hubbard (MH) phase in the quasi-one-dimensional Br-bridged Pd compound, [Pd(en)2Br](Cn--Y)2\CdotH2O (n=4{\mbox{--}}9, and 12) (en: ethylenediamine, Cn--Y: dialkyl-sulfosuccinate), were investigated by means of crystal-structure analyses and Raman spectroscopy. From the systematic evaluations of the bridging-bromine displacements \delta reflecting the CDW amplitudes, the distance L between the neighboring two Pd ions, and the Raman frequency \omega_{\text{S}} of the symmetric Pd--Br stretching mode, we demonstrated that \omega_{\text{S}} is a good measure of the CDW amplitude. By scrutinizing the variations of \omega_{\text{S}} in the pressure-induced and the temperature-induced CDW-to-MH transitions, we discuss the nature of the CDW-to-MH transitions in this category of materials.
- 2012-07-15
著者
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Yamashita Masahiro
Department Of Bioengineering Tokyo Institute Of Technology
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Takaishi Shinya
Department Of Chemistry Graduate School Of Science Tohoku University
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Okamoto Hiroshi
Department Of Advanced Biological Sciences For Regeneration (kotobiken Medical Laboratories) Tohoku
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Takaishi Shinya
Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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Matsuzaki Hiroyuki
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
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Okamoto Hiroshi
Department of Advanced Materials Science, Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
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Takamura Mitsuhito
Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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Kumagai Shohei
Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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