Thermal Release of Hidden Magnetic Moments in High T-c Bi:2223/Ag Superconducting Tape During Warming to T-c


Celebi S. , LeBlanc M. A. R.

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, vol.25, no.4, pp.791-797, 2012 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 4
  • Publication Date: 2012
  • Doi Number: 10.1007/s10948-011-1340-0
  • Title of Journal : JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
  • Page Numbers: pp.791-797

Abstract

We report on measurements of the evolution of the magnetization aOE (c) M >, upon warming from T (0) (77 K) to T (c) , for Bi:2223/Ag tape prepared by the continuous filling and forming (CTFF) with the locus of aOE (c) M > initially situated along bridges between the envelopes of the major hysteresis curves. Concentric, oppositely directed magnetic moments coexist in the specimens when aOE (c) M > lies along the bridges. We focused on the cases where aOE (c) M >=0, hence before warming, the constituent moments cancel each other exactly. Since they diminish in magnitude at different rates as T is increased to T (c) , their sequential "release" leads to a rich variety of phenomena. A comparison of experimental and theoretical results shows that our simple model semiquantitatively reproduces the major features of the observations on the specimen of Bi:2223/Ag tape.