Flux pinning and vortex dynamics in MgB₂ doped with TiO₂ and SiC inclusions

The mixed-state superconducting properties of bulk MgB₂ + 2 at.% TiO₂ and + 8 at.% SiC, prepared by the in situ solid state reaction, have been investigated. The analysis on the mixed-state parameters, such as the upper critical field, the coherence length and the Ginzburg–Landau parameter, proves t...

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Бібліографічні деталі
Дата:2009
Автори: Prokhorov, V.G., Kaminsky, G.G., Park, J.S., Eom, T.W., Lee, Y.P., Kang, J.-H., Khokhlov, V.A., Mikheenko, P., Svetchnikov, V.L.
Формат: Стаття
Мова:English
Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2009
Назва видання:Физика низких температур
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Онлайн доступ:http://dspace.nbuv.gov.ua/handle/123456789/117174
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Назва журналу:Digital Library of Periodicals of National Academy of Sciences of Ukraine
Цитувати:Flux pinning and vortex dynamics in MgB₂ doped with TiO₂ and SiC inclusions / V.G. Prokhorov, G.G. Kaminsky, V.L. Svetchnikov, J.S. Park, T.W. Eom, Y.P. Lee, V.A. Khokhlov, P. Mikheenko // Физика низких температур. — 2009. — Т. 35, № 6. — С. 560-570. — Бібліогр.: 46 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
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Резюме:The mixed-state superconducting properties of bulk MgB₂ + 2 at.% TiO₂ and + 8 at.% SiC, prepared by the in situ solid state reaction, have been investigated. The analysis on the mixed-state parameters, such as the upper critical field, the coherence length and the Ginzburg–Landau parameter, proves that the MgB₂ + 2 at.% TiO₂ is a high-к type-II superconductor in the dirty limit while the MgB₂ + 8 at.% SiC corresponds to that in the moderately clean limit. It was shown that the anisotropic grain-boundary pinning is realized in the fine-grained doped MgB₂ polycrystals rather than the electron scattering one. The field-cooled temperature dependences of magnetic moment exhibit a transition of the samples to the paramagnetic state at certain applied magnetic fields, which is treated as manifestation of the paramagnetic Meissner effect. The experimental results are discussed on the base of modern theoretical approaches.