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arXiv · 2410.00443

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

I. V. Morozov·I. K. Shamova·M. A. Yusifov·S. Y. Istomin·T. B. Shatalova·A. I. Boltalin·A. A. Andreev·R. G. Chumakov·T. M. Vasilchikova·A. A. Fedorova·E. A. Ovchenkov·O. S. Volkova
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Abstract

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.

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I. V. Morozov, I. K. Shamova, M. A. Yusifov, S. Y. Istomin, T. B. Shatalova, A. I. Boltalin, A. A. Andreev, R. G. Chumakov, T. M. Vasilchikova, A. A. Fedorova, E. A. Ovchenkov, O. S. Volkova. 2024-10-01. Metal-insulator transition in CaV1-xWxO3 (x=0.1-0.33) perovskites. https://doi.org/10.1016/j.jallcom.2024.178359

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