Degradation of the second critical magnetic field in multilayered composites with nanodimensional layers of niobium and Nb-Ti superconducting alloy |
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| Authors: | V P Korzhov M I Karpov V N Zverev and A V Nikulov |
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| Institution: | 1.Institute of Solid-State Physics,Russian Academy of Sciences,Chernogolovka, Moscow oblast,Russia;2.Institute of Microelectronic Technology and Ultrahigh Purity Materials,Russian Academy of Sciences,Chernogolovka, Moscow oblast,Russia |
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| Abstract: | Multilayered tapes containing layers of superconducting niobium alloys with 30 and 31 wt % Ti and separated by niobium layers
were investigated. The layers were ∼140 to ∼10 nm thick. Effective pinning of superconducting vortex filaments was observed
on the interlayer Nb-NbTi interfaces. It was established that second critical magnetic field H
c2 decreased as the layer thickness decreased. With thin layers, its magnitude depended on the orientation of rolling the tape
with respect to the external magnetic field. Results are explained by the proximity effect. |
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