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arXiv · 0812.3504

Magnetic relaxation in pulse-magnetized high-temperature superconductors

A. A. Kartamyshev·E. P. Krasnoperov·Yu. D Kuroedov·N. A. Nizhelskiy·O. L Poluschenko
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Abstract

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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A. A. Kartamyshev, E. P. Krasnoperov, Yu. D Kuroedov, N. A. Nizhelskiy, O. L Poluschenko. 2008-12-18. Magnetic relaxation in pulse-magnetized high-temperature superconductors. https://doi.org/10.1016/j.physc.2009.05.002

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