Critical currents and vortex pinning in U/n treated Bi2223/Ag tapes

✍ Scribed by I. Kušević; E. Babić; D. Marinaro; S.X. Dou; R. Weinstein

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 244 KB
• Volume: 408-410
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2004.03.064

✦ Synopsis

Critical currents J c ðT ; BÞ for virgin and four 235 U doped Bi2223/Ag tapes irradiated with thermal neutrons (U/n treated) were measured in the temperature range T P 50 K and magnetic field B 6 1 T. Below 97 K vortex pinning in U/ n treated tapes increases with matching field B / , as evidenced by a weaker B dependence of J c on increasing B / . Hence, the field B max (F p max ¼ J c B max ) and the irreversibility field B irr ðF p ! 0Þ of U/n treated tapes are enhanced compared to those for virgin tape. Since the rate of the enhancement of B max and B irr with B / depends on T , one can tune the maximum enhancement at desired T .