Metal-insulator transition in EuO

TL;DR

This paper models the metal-insulator transition in Eu-rich EuO using an extended Kondo lattice model, successfully reproducing key experimental features including resistivity jumps and colossal magnetoresistance.

Contribution

It introduces a theoretical simulation of EuO's metal-insulator transition that captures experimental resistivity behavior and magnetoresistance.

Findings

Resistivity jump magnitude depends on oxygen vacancy concentration

Low-temperature resistance minimum observed in high-resistivity samples

Colossal magnetoresistance is quantitatively reproduced

Abstract

It is shown that the spectacular metal-insulator transition in Eu-rich EuO can be simulated within an extended Kondo lattice model. The different orders of magnitude of the jump in resistivity in dependence on the concentration of oxygen vacancies as well as the low-temperature resistance minimum in high-resistivity samples are reproduced quantitatively. The huge colossal magnetoresistance (CMR) is calculated and discussed.