Stability of Bilayer Superconductors against Thermomagnetic Avalanche

S.V. Vasiliev a, O.M. Chumaka,b, V.V. Chabanenkoa,c, F. Pérez-Rodríguez c and A. Nabiałek d aO. Galkin Institute of Physics and Technology, National Academy of Sciences, 72 R. Luxemburg, 83114, Donetsk, Ukraine bDonetsk National University, 24 Universitetskaya, 83055, Donetsk, Ukraine cInstituto de Física, Benemérita Universidad Autónoma de Puebla, Apartado Postal J-48 Puebla, 72570 Puebla, México dInstitute of Physics, PAS, al. Lotników 32/46, 02-668 Warsaw, Poland

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The problem of stability of bilayer type II superconductor with different critical current densities of inner part and coating was considered. The optimum thickness of surface layer enabling the maximal increase of the field of first flux jump was found. The field of instability for such bilayer structure was calculated for NbTi superconductor. An increase of the field of the first flux jump by about 60% has been found for optimal coating thickness.

DOI: 10.12693/APhysPolA.126.A-84 PACS numbers: 74.25.Op, 74.72.-h, 74.25.Sv