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

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.