Paramagnetic phase observed by electron spin resonance in the phase separated Pr0.65Ca0.25Sr0.10MnO3 manganite below the order temperature

We present electron spin resonance (ESR) data at 9.4 GHz in the phase separated Pr0.65Ca0.25Sr0.10MnO3 manganite. The coexistence of two resonance lines are observed below the short-range magnetic-order temperature (Ts∼255 K). One of the ESR line is a paramagnetic contribution retained from the high-temperature phase. The second contribution appears at Ts, which is associated with the presence of ferromagnetic regions. The two contributions can be seen near the charge-order transition, TCO∼210 K. We study the temperature evolution of the resonance field and the linewidth of the ESR lines