Magnetic relaxation in pulse-magnetized high-temperature superconductors

Details Magnetic relaxation in pulse-magnetized high-temperature superconductors Magnetic relaxation in pulse-magnetized high-temperature superconductors

2008-12-18

arxiv.org/abs/0812.3504v1

Physics

Condensed Matter

Superconductivity

8 pages, 4 figures

Scientific paper

A magnetic field relaxation at the center of a pulse-magnetized single-domain Y-Ba-Cu-O superconductor at 78K has been studied. In case of a weak magnetization, the magnetic flux density increases logarithmically and normalized relaxation rate defined as S=-d(lnB)/d(lnt) is negative (S=-0.037). When an external magnetic field magnitude increases, the relaxation rate first decreases in absolute value, then changes sign (becomes positive, S>0) and after reaching some maximum finally reduces to a very small value. Non-monotonous dependence of S vs Ha is explained by a non-homogeneous local temperature distribution during a pulse magnetization.

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