Probability density function for the critical current asymmetry of a HTS dc SQUID

J. T. Jeng, Y. C. Lin, K. H. Huang, C. H. Wu, K. L. Chen, J. C. Chen, H. C. Yang, S. H. Liao, H. E. Horng

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Abstract

A de SQUID consisting of grain boundary Josephson junctions may often be asymmetric owing to the large critical-current spread. In this work, the probability density function (PDF) for the critical-current asymmetry of high-transition-temperature-superconductor (HTS) dc SQUID was investigated. To model the critical-current spread in the grain boundaries, we assumed that the barrier thickness of the Josephson junction fluctuated according to a log-Weibull distribution. The resultant PDF for the critical-current spread that fits the histogram data of critical currents reported in literature was the gamma distribution. With the proposed distribution function, the corresponding PDF for the critical-current asymmetry parameter of a HTS dc SQUID was derived and compared with the experimental result. The proposed gamma distribution function is useful in modeling devices, such as the SQUID array and the superconducting quantum interference grating, consisting of many grain-boundary Josephson junctions.

Original languageEnglish
Pages (from-to)1117-1122
Number of pages6
JournalJournal of the Korean Physical Society
Volume48
Issue number5 I
Publication statusPublished - 2006 May 1

Keywords

  • Critical-current asymmetry
  • Dc SQUID

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Jeng, J. T., Lin, Y. C., Huang, K. H., Wu, C. H., Chen, K. L., Chen, J. C., Yang, H. C., Liao, S. H., & Horng, H. E. (2006). Probability density function for the critical current asymmetry of a HTS dc SQUID. Journal of the Korean Physical Society, 48(5 I), 1117-1122.