Abstract
We discuss the properties of new superconducting compositions of ruthenocuprates Ru1−x Sr2RECu2+x O8−d (RE=Gd, Eu) that were synthesized at 600 atm. of oxygen at 1080°C. By changing ratio between the Ru and Cu, the temperature of superconducting transition (TC) raises up to T max C = 72 K for x=0.3, 0.4. The hole doping achieved along the series increases with Cu→Ru substitution. For x ≠ 0, TC can be subsequently tuned between T max C and 0 K by changing oxygen content in the compounds. The magnetic characteristics of the RE=Gd and Eu based compounds are interpreted as indicative of constrained dimensionality of the superconducting phase. Muon spin rotation experiments reveal the presence of the magnetic transitions at low temperatures (T m=14-2 K for x=0.1–0.4) that can originate in the response of Ru/Cu sublattice. RuSr2Gd1−y Ce1−y Cu2O8 (0 ≤ y ≤ 0.1) compounds show the simultaneous increase of TN and decrease of TC with y. The effect should be explained by the electron doping that occurs with Ce→Gd substitution. Properties of these two series allow us to propose phase diagram for 1212-type ruthenocuprates that links their properties to the hole doping achieved in the systems. Non-superconducting single-phase RuSr2GdCu2O8 and RuSr2EuCu2O8 are reported and discussed in the context of the properties of substituted compounds.
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Klamut, P.W. et al. (2002). Magnetism and Superconductivity in Ru1−x Sr2RECu2+x O8−d (RE=Gd, Eu) and RuSr2Gd1−y Ce y Cu2O8 Compounds. In: Noce, C., Vecchione, A., Cuoco, M., Romano, A. (eds) Ruthenate and Rutheno-Cuprate Materials. Lecture Notes in Physics, vol 603. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45814-X_12
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DOI: https://doi.org/10.1007/3-540-45814-X_12
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