Magnetic susceptibility and electron spin resonance of the semiconducting mixed crystal V2MoO8 (V2O5 · MoO3)

The transition metal lattice sites of V₂MoO₈ are occupied by vanadium- and molybdenum ions in a disordered way. Our measurements of the magnetic susceptibility and the electric conductivity show that V₂MoO₈ is paramagnetic and semiconducting. The ESR investigations prove the existence of localizedd electrons (Anderson localization). A hopping process of thesed electrons in vanadium 3d orbitals leads to an ESR line narrowing. Above 50 K a line broadening occurs which is interpreted as a shortening of the effective lifetime of the localizedd electrons.