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    • Keywords


      rf-SQUID; high temperature superconductivity; Josephson junctions; Y-Ba-Cu-O superconductor

    • Abstract


      A 2-hole rf SQUID has been fabricated using naturally present grain boundary Josephson weaklinks in a microbridge of bulk Y-Ba-Cu-O superconductor. Periodic oscillations in voltage-flux characteristics have been observed up to 80.5 K. The spectral density of flux noise of the SQUID is 8 × 10−4 Φ0/√Hz at 100 Hz and 77 K for open-loop mode. The SQUID has been successfully operated in flux-locked-loop mode at 77 K, demonstrating the feasiblity of the device for practical applications. In the flux-locked-loop mode the stability as well as flux noise of the SQUID has been found to improve considerably as compared to that in the open-loop mode. Various SQUID parameters have also been estimated and reported here.

    • Author Affiliations


      S K Arora1 A K Gupta1 Neeraj Khare1 Ramesh Chandra1 V S Tomar1

      1. National Physical Laboratory, K S Krishnan Road, New Delhi - 110 012, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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