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• W2009202330 abstract "Abstract Predominantly single phase polycrystalline Gd 1− x Pr x Ba 2 Cu 3 O 7− y (GdPr-123) samples with 0 ≤ x ≤ 1.0 have been prepared by standard solid state reaction technique and characterized by XRD. The electrical resistivity measurements show the suppression of superconductivity with increasing x . Two plateaus appear in the T c versus x curve at x ≈ 0−0.05 and at x ≈ 0.15−0.25 followed by a decrease to zero at x cr ≈ 0.45, similar to the plateaus of T c versus 7 − y curve at 7 − y ≈ 6.8 −7 and at 7 − y ≈ 6.55−6.75 in R Ba 2 Cu 3 O 7 − y ( R -123) ( R : Y or rare earth except Ce, Pr, Pm, Tb) systems. The valency of Pr was determined by magnetization measurements in the temperature range 100 K to 250 K. This data indicates a mixed valence state for Pr ions with an effective magnetic moment μ ≈ 2.69 μ B per Pr ion, which yields a valency for Pr of ≈ 3.86 +. For these systems, T c ( x ) does not follow the Abrikosov-Gor'kov pair breaking theory. We suggest that the suppression of superconductivity by Pr-substitution can be explained by means of an effective increasing of the oxygen deficiency in the structure, in a similar way to what happens in an R -123 system, when 7 − y is decreased in a controlled manner. This implies that CuO 2 planes are responsible for superconductivity through the effect of chains." @default.
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• W2009202330 date "1996-09-01" @default.
• W2009202330 modified "2023-09-27" @default.
• W2009202330 title "Role of Pr substitution as deoxygenation in suppression of superconductivity in GdPr-123 system" @default.
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• W2009202330 doi "https://doi.org/10.1016/0921-4534(96)00401-7" @default.
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