Two-dimensional frustrated magnetic state in superconducting RuSr2Eu1.5Ce0.5Cu2O10

S. Garcia; L. Ghivelder; I. Felner

doi:10.1103/PhysRevB.79.054506

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Two-dimensional frustrated magnetic state in superconducting RuSr2Eu1.5Ce0.5Cu2O10

S. Garcia, L. Ghivelder, I. Felner

DOI 10.1103/PhysRevB.79.054506 · Physical Review B

T1

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Abstract

In this paper we investigate the magnetic state and the role of the crystalline structure in RuSr2Eu1.5Ce0.5Cu2O10 (Ru-1222). Measurements were made in the isomorphic series (Nb1−xRux)Sr2Eu1.5Ce0.5Cu2O10 [(Nb,Ru)-1222], with 0≤x≤1. Three-dimensional (3D) XY fluctuations above the magnetic transition were not observed in Ru-1222, suggesting a weak interplane coupling between the RuO2 layers. The compositional dependence of the magnetic susceptibility shows a rapid broadening with increasing Nb content, explained in terms of a cluster-glass state. The variation in several superconducting parameters as a function of Ru content is linear in the whole concentration range, with no jumps at the critical concentration for which percolation of long-range order is expected. 3D Arrhenius- and Vogel-Fulcher-type dependencies fail to describe the dynamic properties. Fitting of a generalized Vogel-Fulcher-type dependence, with ln(τ/τ0)=A(T−T0)−B, yields B=2.0, in excellent agreement with Monte Carlo simulations for two-dimensional (2D) systems. The value deduced for T0 agrees well with the reopening of hysteresis in the M(H) curves. The observed superconducting and magnetic features are explained in terms of a scenario of 2D magnetic islands at the RuO2 layers, with no long-range magnetic order.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
RuSr2Eu1.5Ce0.5Cu2O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	onset
RuSr2Eu1.5Ce0.5Cu2O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	onset
RuSr2Y1.5Ce0.5Cu2O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
RuSr2RCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown