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Change of surface critical current in the surface superconductivity and mixed states of superconducting Niobium

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arxiv 1609.07340 v1 pith:M6E6X4EF submitted 2016-09-23 cond-mat.supr-con

Change of surface critical current in the surface superconductivity and mixed states of superconducting Niobium

Muhamad Aburas , Alain Pautrat , Natalia Bellido This is my paper
classification cond-mat.supr-con
keywords surfacecriticalcurrentchangemixedniobiumobservedstate
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A systematic study of irreversible magnetization was performed in bulk Niobium after different surface treatments. Starting with smooth surfaces and abrading them, a strong increase of the critical current is observed up an apparent limiting value. An impressive change of the critical current is also observed in the surface superconductivity (SSC) state, reaching values of the same order of magnitude as in the mixed state. We explain also the observation of strong SSC for magnetic field perpendicular to larges facets in terms of nucleation of SC along bumps of a corrugated surface.

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