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In this paper we investigate the magnetic state and the role of thecrystalline structure in RuSr2Eu1.5Ce0.5Cu2O10 (Ru-1222). Measurements weremade in the isomorphic series (Nb1-xRux)Sr2Eu1.5Ce0.5Cu2O10 [(Nb,Ru)-1222],with x between 0 and 1. 3D XY fluctuations above the magnetic transition werenot observed in Ru-1222, suggesting a weak inter-plane coupling between theRuO2 layers. The compositional dependence of the magnetic susceptibility showsa rapid broadening with increasing Nb content, explained in terms of acluster-glass state. The variation of several superconducting parameters as afunction of Ru content is linear in the whole concentration range, with nojumps at the critical concentration for which percolation of long range orderis expected. 3D Arrhenius and Vogel-Fulcher-type dependencies fail to describethe dynamic properties. Fitting of a generalized Vogel-Fulcher-type dependence,with ln(tau/tau0) = A(T-T0)^-B, yield B = 2.0, in excellent agreement withMonte Carlo simulations for 2D systems. The value deduced for T0 agrees wellwith the re-opening of hysteresis in the M(H) curves. The observedsuperconducting and magnetic features are explained in terms of a scenario of2D magnetic islands at the RuO2 layers, with no long range magnetic order.

Two dimensional frustrated magnetic state in superconducting RuSr2Eu1.5Ce0.5Cu2O10 (Ru-1222)