Vortex shaking and magnetic relaxation in superconductors
β Scribed by E.H. Brandt; G.P. Mikitik
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 250 KB
- Volume
- 408-410
- Category
- Article
- ISSN
- 0921-4534
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β¦ Synopsis
In a superconducting strip in perpendicular dc magnetic field, the application of a weak ac magnetic field perpendicular to the dc field causes the irreversible currents to relax rapidly. This effect allows the reversible magnetic moment to be measured in spite of vortex pinning. It is explained for both transverse and longitudinal vortex shaking, when the ac field is transverse to or along the irreversible currents circulating in the strip.
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A mesoscopic superconductor with a magnetic moment in its center exhibits confined vortex loops with threefold symmetry in its center. Here, we show how the boundaries can affect this symmetry by considering a superconducting cube and sphere.