Metal – insulator transition in CaV1-xWxO3 (x = 0.1–0.33) perovskites

Novel CaV1-xWxO3 (0.1 ≤ x ≤ 0.33) oxides with an orthorhombically distorted perovskite structure of GdFeO3 type have been synthesized. These compounds contain in B-position W+6 and V cations in an oxidation state between + 4 (CaVO3) and + 3 (x = 0.33). CaV0.9W0.1O3 compound possesses metallic type of conductivity and Pauli paramagnetism. The intermediate compositions are between bad metal and semiconducting type of behavior with paramagnetic response. CaV0.67W0.33O3 is a Mott insulator with localized V+3 moments coupled by strong antiferromagnetic interactions. It demonstrates the reduction of effective magnetic moment at high temperatures and canonical spin glass state formation with the freezing temperature Tg = 27.5 K seen in dc - and ac - magnetic susceptibility. Disorder in the magnetic subsystem induces a broad peak in magnetic contribution of the heat capacity at Tmax = 46 K. •Novel CaV1-xWxO3 (0.1 ≤x ≤ 0.33) oxides with distorted perovskite structure of GdFeO3 type obtained.•Metal – insulator transition in CaV1-xWxO3 (x = 0.1–0.33) is observed.•CaV0.9W0.1O3 possesses metallic type of conductivity and Pauli paramagnetism.•CaV0.67W0.33O3 is an insulator with localized V+3 moments which induce spin glass state near Tg= 27.5 K.