Griffiths-Like Phase in Nanocrystalline Manganite La0.85Ca0.15MnO3
M. Pękałaa, K. Pękała b, J. Szydłowska a and V. Drozd c
aChemistry Department, Warsaw University, Warsaw, Poland
bPhysics Department, Warsaw University of Technology, Warsaw, Poland
cFlorida International University, Miami, FL 33199, USA
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The ferromagnetic Curie temperatures TC derived from a temperature derivative of AC susceptibility are equal to 106 K and 161 K for the nanocrystalline and polycrystalline manganites, respectively. The magnetic susceptibility and electron spin resonance confirm that the Griffiths-like phase exists above the Curie temperature in paramagnetic matrix of the nanocrystalline manganite. An analysis of electron spin resonance spectra allows to detect the upper temperature limit for an existence of Griffiths-like phase at temperature TGI=290 K, which is somewhat higher than the TG of the magnetic susceptibility.

DOI: 10.12693/APhysPolA.131.774
PACS numbers: 75.50.Tt, 75.40.Cx, 76.30.-v