Evidence for Possible Phase-Separations in RuSr2(Gd,Ce)2Cu2O10-delta

Abstract

An unusual thermal-magnetic hysteresis was observed between a minor magnetic transition around 120 K and the main one at 80 K in superconducting RuSr2(R,Ce)2Cu2O10-delta (Ru1222R) samples, where R = Gd or Eu, down to a submicron length-scale. The observation suggests a possible phase-separation and is consistent with the very small but universal demagnetizing factor observed, which is difficult to reconcile with the canted spin-structure previously proposed. In such a scenario, the unusual superconducting properties of the Ru-based cuprates can also be understood naturally.

8 pages, 3 figures, submitted to Phys. Rev. B, "Rapid Communications" (September 26, 2001)

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• Magnetic Transitions and Ferromagnetic Clusters in RuSr2(Eu,Ce)2Cu2O10+d
• Unusual Field-Dependence of the Intragrain Superconductive Transition in RuSr2EuCu2O8
• Magneto-transport study of intra- and intergrain transitions in the magnetic superconductors RuSr2GdCu2O8 and RuSr2(Gd1.5Ce0.5)Cu2O10
• Magnetic and superconducting properties of RuSr2 Gd1.5Ce0.5Cu2O10-x samples: dependence on the oxygen content and ageing effects
• The Superconductivity, Intragrain Penetration Depth and Meissner Effect of RuSr2(Gd,Ce)2Cu2O10+delta
• Magnetization study of RuSr2Y1.5Ce 0.5Cu2O10 (Ru-1222)
• Search for Magnetic Order in Superconducting RuSr2Eu1.2Ce0.8Cu2O10
• Tuning the superconducting state in the magnetic MoSr2YCu2O8 materials
• Competition of Superconductivity and Magnetism in MoSr2R1.5Ce0.5Cu2O10-d (R=Rare-earth, Mo-1222)
• Separation Between Antiferromagnetic and Ferromagnetic Transitions in Ru_1-xCu_xSr_2EuCu_2O_8+d
• Magnetism and Superconductivity in RuM1.5Ce0.5Sr2Cu2O10 (M=Eu and Y)
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• Towards universal magnetization curves in the superconducting state of RuSr2GdCu2O8
• Two dimensional frustrated magnetic state in superconducting RuSr2Eu1.5Ce0.5Cu2O10 (Ru-1222)
• Magneto-Superconductivity of Rutheno-Cuprates