Наукова електронна бібліотека
періодичних видань НАН України
періодичних видань НАН України
Flux pinning and vortex dynamics in MgB₂ doped with TiO₂ and SiC inclusions
Репозиторій DSpace/Manakin
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Flux pinning and vortex dynamics in MgB₂ doped with TiO₂ and SiC inclusions
Тема:
Свеpхпpоводимость, в том числе высокотемпеpатуpная
Інший ID:
PACS: 74.70.Ad, 74.25.Qt, 74.25.Sv
Посилання:
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.
Підтримка:
This work was supported by the KOSEF through the
Quantum Photonic Science Research Center, by MEST,
and by Research fund of HYU (HYU-2008-000-0000-7783),
Korea. V. Svetchnikov is grateful to the financial support by
Netherlands Institute for Metal Research.
Дата:
2009
Переглядів:
669
Завантажень:
570
Анотація:
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.
