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Influence of Filament Diameter on Superconducting Properties of MgB2 Multi-core Wires
M. Reissner,L. Bulla,I. Husek,T. Meliˇsek,P. Kov´aˇc 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Magnetic behaviour of a series of MgB2 wires, in each case with 19 filaments of superconductor,surrounded by Ti as barrier and reinforced by stainless steel, prepared in the same way but mechanicallydeformed to different filament diameters Φ between 58.5 and 17.7 µm, was investigated. Whereas no influence of Φ on superconducting transition temperature is found, the width of thetransition increases with Φ. Critical current density, irreversibility line and mean effective activationenergy U decrease systematically with decreasing Φ. From a comparison of the field dependence ofthe pinning force and the temperature dependence of U, it is concluded, that pinning is dominatedat low fields by grain boundary pinning and at higher fields by point defect pinning, with a ratherbroad distribution of pinning energies.