NDLI: Time-dependent magnetization of a type-II superconductor numerically calculated by using the flux-creep equation

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Time-dependent magnetization of a type-II superconductor numerically calculated by using the flux-creep equation

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Journal of the Korean Physical Society : Volume 61, Issue 3, August 2012

Journal of the Korean Physical Society : Volume 61, Issue 2, July 2012

Journal of the Korean Physical Society : Volume 61, Issue 1, July 2012

Journal of the Korean Physical Society : Volume 60

Time-dependent magnetization of a type-II superconductor numerically calculated by using the flux-creep equation

Content Provider	Springer Nature Link
Author	Park, I. S. Jeong, D. Y. Kim, D. Ahmad, D. Ko, R. K. Lee, J. H. Kim, Y. C.
Copyright Year	2012
Abstract	The macroscopic magnetic behaviors of a type-II superconductor, such as the field- or the temperature-dependent magnetization, have been described by using critical state models. However, because the models are time-independent, the magnetic relaxation in a type-II superconductor cannot be described by them, and the time dependence of the magnetization can affect the fieldor the temperature-dependent magnetization curve described by the models. In order to avoid the time independence of critical state models, we try the numerical calculation used by Qin et al., who mainly calculated the temperature dependence of the ac susceptibility χ(T). Their calculation showed that the frequency-dependent χ(T) could be obtained by using the flux-creep equation. We calculated the field-dependent magnetization and magnetic relaxation by using a numerical method. The calculated field-dependent magnetization M(H) curves shows the shapes of a typical type-II superconductor. The calculated magnetic relaxation do not show a logarithmic decay of the magnetization, but the addition of a surface barrier to the relaxation calculation caused a clear logarithmic decay of the magnetization, producing a crossover at a mid-time. This means that the logarithmic magnetic relaxation is caused by not only flux creep but also a combination of flux creep and a surface barrier.
Starting Page	603
Ending Page	608
Page Count	6
File Format	PDF
ISSN	03744884
Journal	Journal of the Korean Physical Society
Volume Number	61
Issue Number	4
e-ISSN	19768524
Language	English
Publisher	The Korean Physical Society
Publisher Date	2012-08-29
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Magnetic relaxation Flux creep Theoretical, Mathematical and Computational Physics Surface barrier Physics Particle and Nuclear Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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