Transport and Magnetic Properties in the Gd1-xCaxVO3 System

Solid solutions of the Gd1-xCaxVO3 system with 0.0 <= x <= 1 were prepared by solid state reactions, and a comprehensive study on their transport and magnetic properties was conducted. This system exhibits a composition-induced metal-insulator transition at x = 0.5-0.6 and an antiferromagnetic-to-paramagnetic transition at x = 0.1-0.2. The metal-insulator transition is mainly attributed to the filling-controlled mechanism. For the samples in the insulator range 0.0 <= x <= 0.5, the transport is subject to the variable range hopping mechanism at low temperatures and the thermally activated mechanism at high temperatures. For the samples in the metal range 0.6 <= x <= 1.0 with itinerant electrons, the magnetic properties show Curie-Weiss dependence rather than Pauli behavior. Pauli paramagnetic properties were observed only for CaVO3 (x =1.0). (C) 2011 The Japan Society of Applied Physics