Evolution of effective magnetic exchange interaction under spin dilution in SrIr$_{1-x}$Sn$_x$O$_3$

TL;DR

This study investigates how magnetic exchange interactions evolve with spin dilution in SrIr$_{1-x}$Sn$_x$O$_3$, revealing a scaling law and highlighting the interplay of charge and spin dynamics in this correlated system.

Contribution

It provides the first detailed analysis of magnetic exchange interaction evolution under spin dilution in SrIr$_{1-x}$Sn$_x$O$_3$, demonstrating a simple scaling law.

Findings

Magnetic excitations remain robust across various doping levels.

Effective magnetic exchange interactions decrease with increasing spin dilution.

The evolution of interactions follows a simple scaling law.

Abstract

Resonant inelastic X-ray scattering measurements reveal robust magnetic excitations in the perovskite iridates SrIr$_{1-x}$Sn$_x$O$_3$. We analyzed the dispersions of the magnetic excitation with spin-dilution ratio $x$ = 0, 0.03, 0.06, 0.1, and 0.2, crossing from semi-metal to spin-diluted while antiferromagnetically ordered insulators. The extracted effective magnetic exchange interactions decrease continuously upon increasing spin dilution, and their evolution follows a simple spin-dilution scaling law. These results not only verify the strong electron-correlation nature of the metallic parent SrIrO$_3$, but also reveal the entanglement of the charge and spin dynamics in this system.