Infrared and Raman Studies of θ-(BEDT-TTF)_2CsZn(SCN)_4 : Comparison with the Frozen State of θ-(BEDT-TTF)_2RbZn(SCN)_4(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• We present the optical conductivity and Raman spectra of θ-(BEDT-TTF)_2CsZn(SCN)_4. The vibrational and vibronic bands in the 1200-1600cm^<-1> region was assigned with the aid of the ^<13>C-substituted compound. The nearly uniform charge distribution was found in a whole temperature range from 300 to 6K. However, the space group symmetry 1222 is locally broken already at room temperature. The broken symmetry suggests the resemblance to the high-temperature phase and frozen state of θ-(BEDT-TTF)_2RbZn(SCN)_4, which consists of short-range ordered charge-ordering domains. The amplitude in the charge-ordering domain of θ-(BEDT-TTF)_2CsZn(SCN)_4 is extremely small in a whole temperature range. At room temperature, hydrostatic pressure narrows the bandwidth of θ-(BEDT-TTF)_2CsZn(SCN)_4 to enlarge the amplitude in short-ranged ordered domains. The long-range ordered charge ordering in θ-(BEDT-TTF)_2CsZn(SCN)_4 was found at 10K under the hydrostatic pressure of 2.5GPa.

• 社団法人日本物理学会の論文
• 2005-09-15

著者

• Suzuki Kenji

  The Graduate University For Advanced Studies And Institute For Molecular Science

• Yakushi K

  Institute For Molecular Science

• Yakushi K

  Inst. Molecular Sci. Okazaki

• Kawamoto Atsushi

  Department Of Quantum And Condensed Matter Physics Graduate School Of Science Hokkaido University

• Kawamoto Atsushi

  Department Of Chemistry Faculty Of Science Nagoya University

• YAMAMOTO Kaoru

  The Graduate University for Advanced Studies and Institute for Molecular Science

• YAKUSHI Kyuya

  The Graduate University for Advanced Studies and Institute for Molecular Science

• Yakushi Kyuya

  Graduate University For Advanced Studies

• Kawamoto Atsushi

  Department of Biology, Faculty of Science, Chiba University

• KAWAMOTO Atsushi

  Department of Physics, Hokkaido University

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