Abstract
We report structural, magnetization, electrical resistivity, nuclear magnetic resonance, and electron spin resonance data of the complex transition metal oxide in which structurally well-defined V-O chains are realized. An itinerant character of the vanadium electrons and ferromagnetic correlations, revealed at high temperatures, are contrasted with the insulating behavior and predominantly antiferromagnetic exchange between the localized magnetic moments which develop below a certain characteristic temperature . Eventually, the compound exhibits short-range magnetic order at . We attribute this crossover occurring around to the unusual anisotropic thermal contraction of the lattice which changes significantly the overlap integrals and the character of magnetic intra- and interchain interactions.
7 More- Received 20 June 2007
DOI:https://doi.org/10.1103/PhysRevB.76.134411
©2007 American Physical Society