Charge order and quasi-one-dimensional behavior in β(β′)-A_xV₂O₅

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• 作者：Ueda ; Yutaka ; Yamada ; Hiroyuki ; Isobe ; Masahiko ; Yamauchi ; Toru
• 关键词：β ; (β ; &prime ; )-A_xV₂O₅ ; Charge order transition ; Quasi-one-dimensional behavior ; Electromagnetic properties
• 刊名：Journal of Alloys and Compounds
• 出版年：2001
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：April 12, 2001
• 卷：317-318
• 期：Complete
• 页码：109-114
• 文件大小：476 K

摘要

Quasi-one-dimensional conductor β(β′)-A_xV₂O₅ (A=Li, Na, Ag, Ca, Sr, Cu) was investigated for its electric and magnetic properties. The β-A_0.33V₂O₅ (A=Li, Na, Ag, Ca, Sr) phases show a phase transition accompanied by a charge separation and a charge order. The low temperature phase of β-A⁺_0.33V₂O₅ shows a long-range magnetic order at lower temperature whereas β-A²⁺_0.33V₂O₅ shows a formation of spin gap without any magnetic order. The magnetic properties of the low temperature phases strongly suggest a linear chain for β-A⁺_0.33V₂O₅ and a two-leg ladder chain for β-A²⁺_0.33V₂O₅ as a charge ordered pattern of magnetic V⁴⁺ ions. A quasi-one-dimensional conductor β′-Cu_0.65V₂O₅ shows a superconducting transition under high pressure around 4 GPa at 5 K.