Transport and magnetic properties of La$_{1-x}$Ca$_x$VO$_3$

TL;DR

This study investigates how calcium doping affects the electrical and magnetic behaviors of LaVO$_3$, revealing an insulator-metal transition and magnetic changes, with disorder and electron correlations playing significant roles.

Contribution

It provides detailed analysis of transport and magnetic properties across various doping levels, highlighting the critical concentration for phase transition and the influence of disorder.

Findings

Insulator-to-metal transition near x=0.2

Resistivity shows T^{1.5} or T^2 dependence at high temperatures

Enhanced molar susceptibility indicates strong electron correlations

Abstract

We report the temperature dependence of transport and magnetic properties of La$_{1-x}$Ca$_x$VO$_3$ for x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5. The system exhibits an insulator-to-metal transition concomitant with an antiferromagnetic-to-paramagnetic transition near x = 0.2 with increasing substitution. Disorder effects are found to influence the low temperature transport properties of both insulating and metallic compositions near the critical concentration. At higher temperatures, the resistivity of the metallic samples is found to exhibit either a $T^{1.5}$ or a $T^2$ dependence depending on the composition. The molar susceptibility for the metallic samples indicate substantial enhancements due to electron correlation.