Structural and Electric Properties of β'-Cu_xV_2O_5 : Condensed Matter: Electronic Properties, etc.
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概要
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Single crystals of β'-Cu_xV_2O_5 have been successfully grown by a self flux method, and their structural, magnetic, and electric properties have been systematically investigated as a function of T and x. The properties of β'-Cu_xV_2O_5 are strikingly different from those of isostructural β-A_xV_2O_5 (A = Na, Ag, etc.). With increasing x, the electrical conductivity of β'-Cu_xV_2O_5 along the b-axis increases monotonously and the metal-insulator transition occurs around x = 0.60. The conductivity is highly anisotropic. For x < 0.43, the system undergoes a structural phase transition at ca. 200 K to an incommensurate (IC) phase. For x ≈ 0.40, the IC phase undergoes another phase transition to a commensurate one. A significant decrease in the conductivity has been found at the latter transition. The explanations of the metal-insulator transition and the structural phase transitions have been given in terms of randomness and Cu-ion ordering, respectively.
- 社団法人日本物理学会の論文
- 2000-05-15
著者
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YAMADA Hiroyuki
Institute of Observational Research for Global Change
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Ueda Yutaka
Institute For Solid State Physic The University Of Tokyo
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