Bipolaronic state of V4+ ion pair in the quasi-one-dimensional conductor MxV2O5 systems

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Abstract

In quasi-one-dimensional conductor MxV2O5 where the mixed valent V4+ and V5+ ions from zig-zag chains, the CDW state were observed below about 200 K in monoclinic phases by X-ray diffraction. The 51V Knight shift results show the spin-singlet ground state of V4+ ion pair (‘bipolaron’) is realized.

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