MOSSBAUER STUDY OF LA0.75CA0.25MN0.98FE0.02O3 COMPOUND

A thorough study of the Mossbauer spectra (MS) of a lightly iron doped (2%) polycrystalline La0.75Ca0.25MnO3 compound has been carried out f rom T=4.2 K up to 300 K. The MS for T > T-C and at T=4.2 K show one co mponent. The corresponding hyperfine parameters are compatible with S = 5/2 Fe3+ in octahedral coordination. As temperature increases from 4 .2 K the spectra consist of several broad sextets and doublets (especi ally the T-C). This first reported behavior of MS resembles that of fe rromagnetic clusters. (C) 1997 American Institute of Physics.