Abstract
The effects of 25 at. % Ga substitution on the Mn site in the ferromagnetic La0.67Ca0.33MnO3 perovskite (TC=265 K)have been studied by ac susceptibility, dc magnetization, neutron-diffraction (ND) and neutron-depolarization (NDP) techniques. The ND study shows a complete absence of long-range magnetic ordering in the substituted sample. However, the presence of spin clusters (with net moments) at T 48 K. A temperature-independent cluster size and moment are prominent at T ≲ 30 K Above 30 K (blocking temperature), superparamagnetic relaxation is evident
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