Interplay between structure, transport and magnetism in the frustrated S 1/2 system In2VO5

Abstract

Measurements of magnetization, electrical resistivity and nuclear- and electron spin resonance in In2VO5 reveal a remarkable interplay of different degrees of freedom in the zigzag V-0 chains (V 4+, 3d1, S 1/2) which are realized in this material. At high temperatures the d electrons are itinerant and magnetic interactions are ferromagnetic. Below a crossover temperature T* ∼120 K the d states get localized and interact predominantly antiferromagnetically. Though magnetic resonance data clearly indicate the slowing down of the spin-spin correlations by approaching a characteristic temperature Tsro ∼ 20 K the system does not long-range order magnetically. We attribute these peculiar crossover phenomena to the unusual anisotropic thermal contraction of the lattice which controls the localization of the d-states, magnetic exchange and frustration. © 2009 IOP Publishing Ltd.