Low-temperature paramagnetic phase reentrance in praseodymium-doped manganites

While the connection between colossal magnetoresistance and phase separation in praseodymium-doped rare-earth manganites has been well established, the underlying mechanisms enabling this connection still need to be fully understood. This paper thoroughly examines the phase separation in $\mathrm{L}{\mathrm{a}}_{5/8-x}\mathrm{P}{\mathrm{r}}_x\mathrm{C}{\mathrm{a}}_{3/8}\mathrm{Mn}{\mathrm{O}}_3$ ($x=0.40$) using an integrated approach including magnetotransport, electron spin resonance, and magnetic susceptibility. We observed that the initially fluidlike magnetic phase separation at intermediate temperatures transforms into the solidlike phase separation via a glass transition at low temperatures. Magnetization dynamics measurements revealed that this transition is concurrent with the reentrance of the paramagnetic phase. Our findings offer a perspective on the freezing of phase separation fluidlike behavior resulting in the advent of the low-temperature solidlike state, contributing to a deeper understanding of the temperature-dependent behaviors of praseodymium-doped rare-earth manganites.