Calculated Magnetic and Electronic Properties of Pyrochlore Iridates

TL;DR

This study uses density functional theory to analyze the magnetic and electronic properties of pyrochlore iridates, revealing a non-collinear magnetic insulator state and potential for magnetic field-induced insulator-metal transitions, relevant for magneto-resistive applications.

Contribution

It provides a detailed theoretical investigation of pyrochlore iridates' magnetic and electronic structures, highlighting the role of spin-orbit coupling and predicting field-induced phase transitions.

Findings

Ground state is a non-collinear magnetic insulator.

Strong spin-orbit coupling affects electronic band structure.

Potential for insulator-to-metal transition under magnetic field.

Abstract

Using density functional theory and LDA+U method, we investigate magnetic and electronic structure of Y$_{2}$Ir$_{2}$O$_{7}$ and rare-earth based pyrochlore iridates. Our study reveals that the ground state is a non-collinear magnetic insulating state. Due to strong spin-orbit coupling in Ir 5\textit{d}, there is an unusual correlation between the bands near Fermi level and the magnetization direction, resulting in a possibility of insulator-to-metal transition under applied magnetic field. This makes pyrochlore iridates a good candidate for possible magnetoressitance and magnetooptical applications.