Abstract

Quasi-one-dimensional conductor β(β′)-A x V 2O 5 (A=Li, Na, Ag, Ca, Sr, Cu) was investigated for its electric and magnetic properties. The β-A 0.33V 2O 5 (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 + 0.33V 2O 5 shows a long-range magnetic order at lower temperature whereas β-A 2+ 0.33V 2O 5 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 + 0.33V 2O 5 and a two-leg ladder chain for β-A 2+ 0.33V 2O 5 as a charge ordered pattern of magnetic V 4+ ions. A quasi-one-dimensional conductor β′-Cu 0.65V 2O 5 shows a superconducting transition under high pressure around 4 GPa at 5 K.

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