Griffiths like phase in nanocrystalline manganite La0.85Ca0.15MnO3

The ferromagnetic Curie temperaturesTCderived from a temperature derivative of AC susceptibility areequal to 106 K and 161 K for the nanocrystalline and polycrystalline manganites, respectively. The magneticsusceptibility and electron spin resonance confirm that the Griffiths-like phase exists above the Curie temperaturein paramagnetic matrix of the nanocrystalline manganite. An analysis of electron spin resonance spectra allows todetect the upper temperature limit for an existence of Griffiths-like phase at temperatureTGI= 290K, which issomewhat higher than theTGof the magnetic susceptibility.