Flux creep and relaxation phenomena in the presence of weak AC magnetic field

Evolution of the dynamic vortex response during the relaxation process In a superconducting slab situated in parallel DC magnetic field H/sub 0/ and superimposed weak AC field h/sub AC//spl sim/ exp(i/spl omega/t) is studied theoretically for the nonlinear vortex diffusion coefficient corresponding...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1997-06, Vol.7 (2), p.1467-1469
Main Authors: Kasatkin, A.L., Pan, V.M., Vysotskii, V.V., Freyhardt, H.C.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity
Creep
Critical currents
Exact sciences and technology
Lattices
Magnetic fields
Magnetic flux
Magnetic liquids
Magnetization
Nonlinear equations
Physics
Properties of type I and type II superconductors
Slabs
Superconductivity
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Summary:Evolution of the dynamic vortex response during the relaxation process In a superconducting slab situated in parallel DC magnetic field H/sub 0/ and superimposed weak AC field h/sub AC//spl sim/ exp(i/spl omega/t) is studied theoretically for the nonlinear vortex diffusion coefficient corresponding to the vortex liquid state. The phenomenon of "dynamical melting" of the vortex lattice at high induced current levels and its possible manifestation in relaxation characteristics of the dynamic vortex response are discussed. The flux creep rate and the irreversible magnetisation decay are shown to be enhanced by application of weak AC magnetic field h/sub AC/.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.620849