Crystal growth and electromagnetic properties of β-vanadium bronzes, β-A_0.33V₂O₅ (A=Ca, Sr and Pb)

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• 作者：Yamauchi ; Touru ; Isobe ; Masahiko ; Ueda ; Yutaka
• 关键词：71.23.&minus ; k ; 71.30.+h ; 71.70.Ms ; 74.72.Yg ; M&ndash ; I transition ; One-dimensional conductor ; Charge ordering ; Weak localization
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2004
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：May, 2004
• 卷：272-276
• 期：Part 1
• 页码：442-443
• 文件大小：206 K

摘要

Single crystals of β-vanadium bronzes, β-A_0.33V₂O₅ (A=Ca, Sr and Pb) were successfully grown by self-flux method (for A=Ca and Sr) and by a chemical transport reaction method using HCl gas as a transport agent (for A=Pb). By using crystals thus obtained, we measured electrical resistivity along the b-axis in the monoclinic structure. The distinct metal–insulator (M–I) transition was observed at 150K for β-Ca_0.33V₂O₅ and at 168K for β-Sr_0.33V₂O₅. The M–I transition is expected to be charge order type as observed in β-Na_0.33V₂O₅. On the other hand, β-Pb_0.33V₂O₅ shows no M–I transition but a smooth crossover from metal to insulator. This crossover seems to be due to the weak localization of very good one-dimensionality.