Exotic physical properties in metallic perovskite LaRuO3 : Strong evidence for Hund metal

Abstract

The Hund's coupling rule is of fundamental importance in atomic physics. It also plays a key role in the determination of physical properties in strongly correlated electron systems where the Fermi energy lies in multiple bands. We report a thorough investigation of a rarely studied $4d$ perovskite oxide ${\mathrm{LaRuO}}_{3}$ by a suite of measurements including transport, magnetization, specific heat, thermoelectric power, thermal conductivity, and neutron and x-ray diffraction. Our results are consistent with theoretical predictions, which makes ${\mathrm{LaRuO}}_{3}$ an exemplary Hund metal.