Flux pinning and vortex dynamics in MgB2 doped with TiO2 and SiC inclusions
Low Temp. Phys. 35, 439 (2009); doi:10.1063/1.3151990
Issue Date: June 2009
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The mixed-state superconducting properties of bulk MgB2+2 at. %TiO2 and +8 at. %SiC, prepared by in situ solid state reaction, are investigated. Analysis of the mixed-state parameters, such as the upper critical field, the coherence length, and the Ginzburg-Landau parameter, proves that MgB2+2 at. %TiO2 is a high-
type-II superconductor in the dirty limit, while MgB2+8 at. %SiC corresponds to that in the moderately clean limit. It is shown that the grain-boundary pinning realized in fine-grained doped MgB2 polycrystals is of the anisotropic rather than the electron-scattering type. The field-cooled temperature dependences of the magnetic moment reveal 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.
©2009 American Institute of Physics
type-II superconductor in the dirty limit, while MgB2+8 at. %SiC corresponds to that in the moderately clean limit. It is shown that the grain-boundary pinning realized in fine-grained doped MgB2 polycrystals is of the anisotropic rather than the electron-scattering type. The field-cooled temperature dependences of the magnetic moment reveal 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.
©2009 American Institute of Physics
| History: | Submitted 22 January 2009; revised 13 February 2009 |
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1063-777X (print)
1090-6517 (online)
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