Magnetization scaling in the ruthenate-cuprate RuSr 2 Eu 1.4 Ce 0.6 Cu 2 O 10-δ (Ru-1222)

S. Garcia (), L. Ghivelder, S. Soriano and I. Felner

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 53, issue 3, 307-313

Abstract: The magnetic properties of the superconducting ruthenate-cuprate RuSr 2 Eu 1.4 Ce 0.6 Cu 2 O 10-δ (Ru-1222) have been studied by a scaling analysis of the dc magnetization and ac susceptibility measurements. Non-linear M(H) curves reveal the presence of nano-size clusters with a net magnetic moment of ∼10 2 μ B at 180 K, near the deviation from a Curie-Weiss behavior. On cooling, no scaling was observed down to 90 K, discarding the possibility of magnetic phase separation of collinear ferromagnetic particles. We explain this result in terms of a variable number of contributing particles, with a temperature dependent net magnetic moment. For 70 K ≤T≤ 90 K the scaling plots evidence the emergence of a system of non-interacting particles, which couple on further cooling. The observed cluster-glass features are preserved down to the lowest measured temperature (10 K); no signature of long-range order was detected. The frequency shift of the peak in the real part of the ac susceptibility does not follow the Vogel-Fulcher type dependence, as previously reported. The puzzling temperature dependence of the coercive field, H C (T), is correlated with the changes in the scaling factors. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 74.25.Ha Magnetic properties; 74.70.Pq Ruthenates (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00393-4

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