Finite-size effect on evolution of Griffiths phase in manganite nanoparticles

TL;DR

This study investigates how reducing nanoparticle size in manganite affects the Griffiths phase, revealing that smaller particles strengthen the phase and exhibit finite-size scaling behavior.

Contribution

It demonstrates the finite-size scaling of Griffiths phase evolution in manganite nanoparticles, linking particle size to magnetic phase properties.

Findings

Griffiths phase persists in all nanoparticle sizes studied.

Critical temperature $T_c^R$ decreases with particle size.

Shift of $T_c^R$ follows finite-size scaling law.

Abstract

The finite-size effect on the evolution of Griffiths phase (GP) is studied using nanoparticles of half-doped manganite Pr$_{0.5}$Sr$_{0.5}$MnO$_{3}$ with different average particle sizes but having similar structural parameters. All the samples exhibit pronounced GP behavior. With reducing particle size, the Griffiths temperature remains almost unchanged but the characteristic critical temperature $T_c^R$ decreases and the GP properties are strengthened. It is noteworthy that the shift of $T_c^R$ follows finite-size scaling with the particle size revealing an exotic interplay between the GP properties and the sample dimension. This reinforces an earlier proposal of length-scale related evolution of GP.