# Evolution of structure, magnetism and electronic transport in doped pyrochlore iridate Y$_2$Ir$_{2-x}$Ru$_{x}$O$_7$

## TL;DR

This study explores how doping pyrochlore iridate Y$_2$Ir$_{2-x}$Ru$_{x}$O$_7$ affects its structure, magnetism, and electronic transport, revealing gradual changes in properties without phase transitions.

## Contribution

It provides detailed insights into the structural, magnetic, and electronic evolution of Y$_2$Ir$_{2-x}$Ru$_{x}$O$_7$ with Ru doping, highlighting the interplay between spin-orbit coupling and electron correlation.

## Key findings

- Lattice parameters evolve with Ru doping.
- Ru adopts a 4+ charge state replacing Ir.
- Magnetic irreversibility decreases with doping.

## Abstract

The interplay between spin-orbit coupling (SOC) and electron correlation ($U$) is considered for many exotic phenomena in iridium oxides. We have investigated the evolution of structural, magnetic and electronic properties in pyrochlore iridate Y$_2$Ir$_{2-x}$Ru$_{x}$O$_7$ where the substitution of Ru has been aimed to tune this interplay. The Ru substitution does not introduce any structural phase transition, however, we do observe an evolution of lattice parameters with the doping level $x$. X-ray photoemission spectroscopy (XPS) study indicates Ru adopts charge state of Ru$^{4+}$ and replaces the Ir$^{4+}$ accordingly. Magnetization data reveal both the onset of magnetic irreversibility and the magnetic moment decreases with progressive substitution of Ru. These materials show non-equilibrium low temperature magnetic state as revealed by magnetic relaxation data. Interestingly, we find magnetic relaxation rate increases with substitution of Ru. The electrical resistivity shows an insulating behavior in whole temperature range, however, resistivity decreases with substitution of Ru. Nature of electronic conduction has been found to follow power-law behavior for all the materials.