Magnetic Field Effect on the Superconducting Transition in (RE)xBa1-xCuOy

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Abstract
The superconducting transition of (RE) x Ba1-x CuO y (RE: Nd, Sm, Eu, Gd, Ho, Yb, Y; 0.25≦x≦0.40) has been studied in magnetic fields up to 6 T. Two-step transitions have been clearly observed in the magnetic fields for most of the samples. The samples are considered to be composed of the orthorhombic phase with a higher T c around or below 90 K, and of the inhomogeneous quasi-tetragonal phase with a lower T c around or below 60 K surrounding the former phase, though the composite ratio depends on the RE-concentration x. The RE-concentration dependence of the transition curve is closely concerned with the ion radius of RE.

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