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The macroscopic magnetizations of a RuSr2(Eu0.7Ce0.3)2Cu2O10+d sample wereinvestigated. A ferromagnet-like transition occurs around T_M in the low-fieldmagnetization. Highly nonlinear M(H), non-Curie-Weiss susceptibility, and slowspin-dynamics, however, were observed up to T_1 approx 2-3 T_M. In addition, anantiferromagnet-like differential-susceptibility maximum of Ru appears around aseparate temperature T_AM between T_1 and T_M. The data are thereforeconsistent with a phase-separation model: superparamagnetic clusters (orshort-range spin-orders) are first precipitated from the paramagnetic matrixbelow T_1, followed by an antiferromagnetic transition of the matrix at T_AMand an apparent ferromagnetic (FM) transition around T_M, where the long-rangespin-order is established in the FM species imbedded in the matrix.Comment: 12 pages, 9 figure

physical review. b, condensed matter

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Magnetic transitions and ferromagnetic clusters inRuSr2(Eu,Ce