# Dynamics of the lattice and spins in the phase-separated manganite (Eu$_{1-x}$Gd$_{x}$)$_{0.6}$Sr$_{0.4}$MnO$_3$

## TL;DR

This study explores how Gd substitution affects the slow magnetic and lattice relaxations in phase-separated manganite, revealing suppression of frozen phases and stabilization of paramagnetic insulating states due to disorder and interaction effects.

## Contribution

It provides new insights into the influence of Gd doping on phase separation dynamics and lattice-spin interactions in manganite materials.

## Key findings

- Gd substitution suppresses frozen phase-separated phases at low temperatures.
- Gd stabilizes the paramagnetic insulating state at intermediate temperatures.
- Relaxations follow a stretched exponential, indicating strong frustration effects.

## Abstract

We investigated slow relaxations of the magnetostriction and residual magnetostriction of the phase-separated system (Eu$_{1-x}$Gd$_{x}$)$_{0.6}$Sr$_{0.4}$MnO$_3$, in which the metamagnetic transition from a paramagnetic insulating state to a ferromagnetic metallic state is accompanied by a lattice shrinkage. The relaxations are well fitted by a stretched exponential function, suggesting the strong frustraction between the double exchange interaction and Jahn-Teller effect. We have revealed that the Gd substitution suppresses the frozen phase-separated phase at low temperatures and stabilizes the paramagnetic insulating state in the dynamic phase-separated phase at intermediate temperatures. The former origin would be the randomness effect and the latter would be the suppression of the double exchange interaction.

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Source: https://tomesphere.com/paper/1703.10392