Abstract.
The magnetic properties of the superconducting ruthenate-cuprate RuSr2Eu 1.4Ce0.6Cu2O10-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 ∼102 μB 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, HC(T), is correlated with the changes in the scaling factors.
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Garcia, S., Ghivelder, L., Soriano, S. et al. Magnetization scaling in the ruthenate-cuprate RuSr2Eu1.4Ce 0.6Cu2O10-δ (Ru-1222). Eur. Phys. J. B 53, 307–313 (2006). https://doi.org/10.1140/epjb/e2006-00393-4
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DOI: https://doi.org/10.1140/epjb/e2006-00393-4