Phase separation and the effect of quenched disorder in $Pr_{0.5}Sr_{0.5}MnO_3$

TL;DR

This study investigates phase separation in Pr0.5Sr0.5MnO3, revealing coexistence of ferromagnetic and antiferromagnetic clusters, and how quenched disorder influences their size and magnetic properties.

Contribution

It demonstrates that quenched disorder promotes antiferromagnetism and reduces ferromagnetic cluster size without introducing new magnetic interactions or lattice distortions.

Findings

Ferromagnetic clusters decrease in size with decreasing temperature.

Antiferromagnetic clusters coexist with ferromagnetic ones below Tc.

Disorder increases resistivity and promotes antiferromagnetic phase formation.

Abstract

The nature of phase separation in $Pr_{0.5}Sr_{0.5}MnO_3$ has been probed by linear as well as nonlinear magnetic susceptibilities and resistivity measurements across the 2nd order paramagnetic to ferromagnetic transition ($T_C$) and 1st order ferromagnetic to antiferromagnetic transition ($T_N$). We found that the ferromagnetic (metallic) clusters, which form with the onset of long-range order in the system at $T_C$, continuously decrease their size with the decrease in temperature and coexist with non-ferromagnetic (insulating) clusters. These non-ferromagnetic clusters are identified to be antiferromagnetic. Significantly, it is shown that they do not arise because of the superheating effect of the lower temperature 1st order transition. Thus reveals unique phase coexistence in a manganite around half-doping encompassing two long-range order transitions. Both the ferromagnetic and antiferromagnetic clusters form at $T_C$ and persist much below $T_N$. Substitution of quenched disorder (Ga) at Mn-site promotes antiferromagnetism at the cost of ferromagnetism without adding any magnetic interaction or introducing any significant lattice distortion. Moreover, increase in disorder decreases the ferromagnetic cluster size and with 7.5% Ga substitution clusters size reduces to the single domain limit. Yet, all the samples show significant short-range ferromagnetic interaction much above $T_C$. Resistivity measurements also reveal the novel phase coexistence identified from the magnetic measurements. It is significant that, increase in disorder up to 7.5% increases the resistivity of the low temperature antiferromagnetic phase by about four orders.