Structural Phase Transitions of the Quasi Two-Dimensional Metal (K_<1-x>Rb_x)_3Cu_8S_6 : X-Ray Scattering Studies

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概要

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• A quasi two-dimensional metal K_3Cu_8S_6 has two phase transitions at T_1 (153 K) and at T_2 (55 K), accompanied by an incommensurate(between T_1 and T_2) and a commensurate (below T_2) superstructures, respectively. On the other hand, the resistivity of Rb_3Cu_8S_6, which is isostructural with K_3Cu_8S_6, suggests that Rb_3Cu_8S_6 has only the T_1 transition. In order to investigate the superstructures of Rb_3Cu_8S_6, X-ray diffuse scattering studies were carried out. The results show that an incommensurate superstructure with a wave vector of (0 η 0), η≃0.45, appears between T_1 and the measuring lowest temperature (about 15 K). The temperature dependence of the intensity of the superstructure is that of an ordinary charge-density wave and there is no evidence for the T_2 transition in Rb_3Cu_8S_6. The X-ray scattering results on the mixed crystals (K_<1-x>Rb_x)_3Cu_8S_6 are also reported.

• 社団法人日本物理学会の論文
• 1993-06-15

著者

• KOJIMA Norimichi

  Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo

• KAGOSHIMA Seiichi

  Department of Basic Science, University of Tokyo

• SATO Hirohiko

  Department of Chemistry,Graduate School of Science and Engineering,Tokyo Institute of Technology

• 小島 憲道

  Department Of Basic Science Graduate School Of Arts And Sciences The University Of Tokyo

• Sato H

  Department Of Chemistry Faculty Of Science Kyoto University

• Kojima N

  Graduate School Of Arts And Sciences University Of Tokyo

• Kojima Norimichi

  Graduate School Of Arts And Science University Of Tokyo

• Kojima Norimichi

  Department Of Basic Science Graduate School Of Arts And Science The University Of Tokyo

• Kagoshima S

  Univ. Tokyo Tokyo

• Kagoshima Seiichi

  Department Of Art And Science The University Of Tokyo

• Sakaguchi K

  Institute For Protein Research Osaka University

• Sato Hirohiko

  Department Of Biotechnology Tokyo University Of Agriculture And Technology

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