E-J characteristic and flux pinning in superconducting PbBi alloys

• Published in: IEEE transactions on applied superconductivity 1997-06, Vol.7 (2), p.2118-2121
• Main Authors: Baorong Ni, Wakuda, T., Funaki, K.
• Format: Article
• Language: English
• Subjects: Applied sciences; Bismuth; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical current density; Current density; Current measurement; Density measurement; Exact sciences and technology; Flux pinning; Magnetic field measurement; Metals, alloys and compounds (a15, 001c15, laves phases, chevrel phases, borocarbides, etc.); Metals. Metallurgy; Metals; alloys and binary compounds (including A15, Laves phases, etc.); Physics; Properties of type I and type II superconductors; Superconducting materials; Superconducting materials (excluding high-tc compounds); Superconductivity; Type II superconductors; Vortex lattices ,flux pinning, flux creep
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/77.621010

The characteristics of electric field E vs. current density J at various magnetic fields and temperatures in superconducting PbBi samples with different pinning strength were measured by using a usual resistive method. The obtained E-J curves show a nonlinear behavior similar to that in high T/sub c/ superconductors (HTSC). With a scaling generally used in HTSC, E-J curves collapse onto one of the two universal branches, with the exponents of /spl nu/ and z similar to those reported in HTSC. It was found that the stronger flux pinning strength leads to the higher transition points of T/sub g/ and B/sub g/ in the E-J characteristic. The nonlinear E-J curves and the enhancement of the transition points were explained and reproduced by using the flux creep and flux flow theory.