Hysteresis of critical currents of superconducting bridges in low perpendicular magnetic fields

• Published in: Journal of low temperature physics Vol. 74; no. 3-4; pp. 263 - 275
• Main Authors: AOMINE, T, TANAKA, E, YAMASAKI, S, TANI, K, YONEKURA, A
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.02.1989
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Metals, alloys and compounds (a15, 001c15, laves phases, chevrel phases, borocarbides, etc.); Metals, semimetals and alloys; Physics; Properties of type I and type II superconductors; Specific materials; Superconducting materials (excluding high-tc compounds); Superconductivity; Magnetic field; Critical current; Superconductivity
• ISSN: 0022-2291; 1573-7357
• DOI: 10.1007/bf00683375

Hysteresis of critical currents I sub(c) of superconducting bridges with In, Nb, and NbN has been studied in low perpendicular magnetic fields. Influences of bridge geometry, small field sweep, trapped flux, and bombardment of argon ions on the hysteresis were made clear. The experimental results suggest that the edge pinning and trapped flux in the bank of bridges are associated with the hysteresis. The peak value of I sub(c) of NbN bridges, as well as granular Al and In bridges reported before, in decreasing fields agrees with the calculated pair-breaking current. The origin of the hysteresis is discussed.