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Ac-magnetic susceptibility in the peak-effect region of Nb3Sn


Bossen, O; Schilling, A; Toyota, N (2013). Ac-magnetic susceptibility in the peak-effect region of Nb3Sn. Physica C: Superconductivity, 492:133-137.

Abstract

We performed a systematic study of the ac magnetic-susceptibility on a Nb3Sn single crystal which displays a strong peak effect near the upper critical field Hc2. In external magnetic fields above μ0H ≈ 3 T, the peak effect manifests itself in a single, distinct peak in the real part χ′(T) of the ac susceptibility as a function of temperature T, the size of which continuously increases with increasing magnetic field H. In the imaginary part χ″(T)χ″(T) of the ac susceptibility, on the other hand, a single peak initially grows with increasing H up to a well-defined value, and then splits into two sharp peaks which separate when H is further increased. We explain this surprising behavior by a flux-creep model and taking into account the enhancement of the critical-current density in the peak-effect region near Tc in which Bean’s critical-state model seems to apply. Outside this region, the crystal is clearly in a flux-creep regime with finite creep exponent n.

Abstract

We performed a systematic study of the ac magnetic-susceptibility on a Nb3Sn single crystal which displays a strong peak effect near the upper critical field Hc2. In external magnetic fields above μ0H ≈ 3 T, the peak effect manifests itself in a single, distinct peak in the real part χ′(T) of the ac susceptibility as a function of temperature T, the size of which continuously increases with increasing magnetic field H. In the imaginary part χ″(T)χ″(T) of the ac susceptibility, on the other hand, a single peak initially grows with increasing H up to a well-defined value, and then splits into two sharp peaks which separate when H is further increased. We explain this surprising behavior by a flux-creep model and taking into account the enhancement of the critical-current density in the peak-effect region near Tc in which Bean’s critical-state model seems to apply. Outside this region, the crystal is clearly in a flux-creep regime with finite creep exponent n.

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Additional indexing

Item Type:Journal Article, not refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2013
Deposited On:18 Feb 2014 13:57
Last Modified:05 Apr 2016 17:38
Publisher:Elsevier
ISSN:0921-4534
Publisher DOI:https://doi.org/10.1016/j.physc.2013.05.028

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