Effect of thermal noise on the characteristics of a high Tc superconducting quantum interference device

Keiji Enpuku, Y. Shimomura, Takanobu Kiss

Research output: Contribution to journalArticle

117 Citations (Scopus)

Abstract

Effects of thermal noise on the characteristics of the dc superconducting quantum interference device (SQUID) have been studied. Numerical simulation on the SQUID characteristics operating at T=77 K has been performed by taking into account the thermal noise. It is shown that the voltage versus flux relation of the dc SQUID is degraded considerably with the thermal noise. The degradation becomes significant when the inductance of the SQUID increases. Due to this degradation, there exists significant limitation for the range of the inductance available at T=77 K, unlike the case at T=4.2 K. The maximum inductance should be around 200 pH in order to avoid significant degradation of the transfer function. This limited value of the inductance must be taken into account when we realize the SQUID coupled to an input coil. The analytical expression for the degradation of the transfer function due to the thermal noise is also obtained. The theoretical result explains experimental results reported recently.

Original languageEnglish
Pages (from-to)7929-7934
Number of pages6
JournalJournal of Applied Physics
Volume73
Issue number11
DOIs
Publication statusPublished - Dec 1 1993

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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