Antiferromagnetic rare region effect in $Pr_{0.5}Ca_{0.5}MnO_3$

TL;DR

This paper reports the coexistence of paramagnetic and antiferromagnetic signals above the Neel temperature in $Pr_{0.5}Ca_{0.5}MnO_3$, indicating AFM rare regions within a Griffiths-like phase.

Contribution

It provides experimental evidence of AFM rare regions above $T_N$ in $Pr_{0.5}Ca_{0.5}MnO_3$, extending the understanding of magnetic phase coexistence.

Findings

Coexistence of EPR and AFMR signals above $T_N$

Identification of AFM rare regions within Griffiths-like phase

Temperature scale $T^*$ extends above room temperature

Abstract

We present evidence of coexistence of electron paramagnetic resonance signal and anti-ferromagnetic resonance signals above the anti-ferromagnetic (AFM) transition ($T_N$) in $Pr_{0.5}Ca_{0.5}MnO_3$. We identify the latter with AFM rare regions within the Griffiths-like phase scenario with the associated temperature scale $T^\ast$ extending above room temperature.