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

We report on measurements of the evolution of the magnetization 〈 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 〈 M 〉 initially situated along bridges between the envelopes of the major hysteresis curves. Concen...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2012-05, Vol.25 (4), p.791-797
Main Authors: Celebi, S., LeBlanc, M. A. R.
Format: Article
Language:English
Subjects:
Applied sciences
Bridges (structures)
Characterization and Evaluation of Materials
Condensed Matter Physics
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical currents
Electrical engineering. Electrical power engineering
Evolution
Exact sciences and technology
Magnetic Materials
Magnetic moment
Magnetic properties
Magnetism
Magnetization
Materials
Original Paper
Physics
Physics and Astronomy
Properties of type I and type II superconductors
Silver
Strongly Correlated Systems
Superconducting tapes
SUPERCONDUCTIVITY
TAPE
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Description
Summary:We report on measurements of the evolution of the magnetization 〈 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 〈 M 〉 initially situated along bridges between the envelopes of the major hysteresis curves. Concentric, oppositely directed magnetic moments coexist in the specimens when 〈 M 〉 lies along the bridges. We focused on the cases where 〈 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.
ISSN:1557-1939
1557-1947
DOI:10.1007/s10948-011-1340-0