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

TL;DR

This study explores the metal-insulator transition in CaV1-xWxO3 perovskites, revealing a progression from metallic to Mott insulating behavior with increasing tungsten content, and identifying magnetic and electronic properties across compositions.

Contribution

It reports the synthesis and characterization of novel CaV1-xWxO3 oxides, detailing their structural, electronic, and magnetic phase transitions as a function of tungsten doping.

Findings

CaV0.9W0.1O3 is metallic and Pauli paramagnetic.

CaV0.67W0.33O3 is a Mott insulator with antiferromagnetic interactions.

Intermediate compositions show bad metal to semiconductor behavior.

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.