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Superconducting properties of 19-filament multi-core MgB2 wires reinforced by stainless steel sheath were investigated by magnetic measurements. The samples have filament diameters, ϕ, between 58 and 17 μm. No influence of ϕ on superconducting transition temperature is found, but width of transition increases with shrinking filament size. Whereas three of the four investigated samples show a systematic...
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