Abstract
Addition of different amount of superconducting Bi1.8Pb0.26Sr2Ca2Cu3 O 10+x on the superconducting properties of polycrystalline MgB2 is investigated. Samples are synthesized using solid-state reaction under argon atmosphere at 775 ∘C. X-ray diffraction (XRD) data shows that major reflection belongs to MgB2 phase along with small amount of MgO. Traces of 2223 phase are seen for MgB2 with higher content of 2223. Absence of significant change in peak positions and in lattice parameters indicates no substitution effect in the present system. Unreacted 2223 phase is present as isolated grains, or clusters at the grain boundaries. The superconducting transition temperature for MgB2 is only marginally influenced with the addition of 2223. Field dependence of critical current density (J c ), however, displays significant enhancement (∼ 2 times) for 1 wt % 2223 added MgB2 pellets. The field dependence of J c is explained well using collective pinning model. Further, the pinning force density of both pure and 2223 added MgB2 displays excellent scaling with respect to the field (h n ), corresponding to which F p drops to half of its maximum value. The observed scaling of normalized pinning force density (F p / F p m a x ) is described well in terms of an expression derived based on J c expression proposed by collective pinning model in small bundle region.
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The authors are thankful to the Central Research Facility, Indian Institute of Technology (Kharagpur) for providing the SQUID VSM (Quantum Design) facility for magnetization measurements.
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Tripathi, D., Dey, T.K. Scaling of Pinning Force Density in (Bi,Pb)-2223 Added MgB2 Superconductors. J Supercond Nov Magn 28, 2025–2032 (2015). https://doi.org/10.1007/s10948-015-3023-8
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DOI: https://doi.org/10.1007/s10948-015-3023-8