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We report structural, magnetization, electrical resistivity and nuclear- andelectron spin resonance data of the complex transition metal oxide In_2VO_5 inwhich structurally well-defined V-O chains are realized. An itinerant characterof the vanadium d-electrons and ferromagnetic correlations, revealed at hightemperatures, are contrasted with the insulating behavior and predominantlyantiferromagnetic exchange between the localized V^{4+} S = 1/2-magneticmoments which develop below a certain characteristic temperature T* ~ 120 K.Eventually the compound exhibits short-range magnetic order at $T_SRO ~ 20 K.We attribute this crossover occurring around T* to the unusual anisotropicthermal contraction of the lattice which changes significantly the overlapintegrals and the character of magnetic intra- and interchain interactions.

Insulator to semiconductor transition and magnetic properties of the one-dimensional S = 1/2 system In_2VO_5