Magnetic Transitions and Ferromagnetic Clusters in RuSr2(Eu,Ce)2Cu2O10+d

Abstract

The macroscopic magnetizations of a RuSr2(Eu0.7Ce0.3)2Cu2O10+d sample were investigated. A ferromagnet-like transition occurs around T_M in the low-field magnetization. Highly nonlinear M(H), non-Curie-Weiss susceptibility, and slow spin-dynamics, however, were observed up to T_1 approx 2-3 T_M. In addition, an antiferromagnet-like differential-susceptibility maximum of Ru appears around a separate temperature T_AM between T_1 and T_M. The data are therefore consistent with a phase-separation model: superparamagnetic clusters (or short-range spin-orders) are first precipitated from the paramagnetic matrix below T_1, followed by an antiferromagnetic transition of the matrix at T_AM and an apparent ferromagnetic (FM) transition around T_M, where the long-range spin-order is established in the FM species imbedded in the matrix.

arXiv comment12 pages, 9 figures

References in corpus (6)

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• "Wigner crystal" and "stripe" models for the magnetic and crystallographic superstructures of La0.333Ca0 .667MnO3
• Magnetic-Superconducting phase-diagram of Eu2-xCexRuSr2Cu2O10
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• Evidence for Possible Phase-Separations in RuSr2(Gd,Ce)2Cu2O10-delta
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• Successive spin glass, cluster ferromagnetic, and superparamagnetic transitions in RuSr2Y1.5Ce0.5Cu2O10 complex magneto-superconductor
• Separation Between Antiferromagnetic and Ferromagnetic Transitions in Ru_1-xCu_xSr_2EuCu_2O_8+d
• Lower critical field and intragrain critical current density in the ruthenate-cuprate RuSr${}_2$Gd${}_{1.5}$Ce${}_{0.5}$Cu${}_2$O${}_{10}$
• Two dimensional frustrated magnetic state in superconducting RuSr2Eu1.5Ce0.5Cu2O10 (Ru-1222)
• The internal magnetic field in superconducting ferromagnets
• Nonlinear magnetic response in ruthenocuprates
• Hysteresis and stepwise structure in MR curves of granular superconducting ruthenocuprates RuSr${}_2$(Gd${}_{1.5}$Ce${}_{0.5})$Cu${}_2$O${}_{10-\delta }$}
• Two component butterfly hysteresis in Ru1222 ruthenocuprate
• Low temperature magnetic transition in RuSr2EuCeCu2O10 ruthenocuprate