Effect of nonmagnetic Ti substitution on the structural, magnetic and transport properties in pyrochlore iridate Eu2(Ir1-xTix)2O7

TL;DR

This study investigates how substituting nonmagnetic Ti into Eu2(Ir1-xTix)2O7 affects its structural, magnetic, and transport properties, revealing increased resistivity, suppressed metal-insulator transition, and reduced magnetic interactions.

Contribution

It provides new insights into the effects of Ti doping on the structural, electronic, and magnetic behavior of pyrochlore iridates, highlighting the interplay between site dilution and physical properties.

Findings

Resistivity increases with Ti doping, suppressing the metal-insulator transition.

Magnetic moment and frustration decrease due to Ti-induced dilution.

Low-temperature conduction follows a power-law behavior.

Abstract

We have studied the effect of nonmagnetic Ti substitution Eu2(Ir1-xTix)2O7 with the help of electrical transport and magnetic measurement. The minor structural modification enhances the orbital overlapping and favours its electrical transport properties with Ti doping though the tuning of SOC and U with site dilution opposes it. As a result, metal insulator transition (MIT) is disappeared and resistivity of the system throughout the temperature increases with Ti doping. The nature of the conduction mechanism at low temperature follows power law like variation. As the Ti4+ is nonmagnetic, the introduction of Ti at Ir site dilutes the magnetic interaction at Ir octahedral network, which in turn decreases the magnetic moment and magnetic frustration in the system though the magnetic irreversibility temperature is hardly affected by Ti.