Low frequency (1/f) noise in YBa2Cu3O 7-δ grain boundary junction dc superconducting quantum interference devices

J. Chen, T. Ogawa, H. Nakamura, H. Myoren, K. Nakajima, T. Yamashita

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

We have studied low frequency (1/f) noise of YBa2Cu 3O7-δ dc superconducting quantum interference devices (SQUIDs) on SrTiO3 bicrystal substrates. 1/f flux noise, either measured at different temperatures for optimized bias current or measured at 77 K for different bias currents, is almost constant. These facts imply that 1/f noise mainly comes from fluctuations of the critical current of the Josephson junction that form the SQUID. Also, we explain the critical current fluctuations in the junction by an equilibrium temperature fluctuation model.

Original languageEnglish
Pages (from-to)1895-1898
Number of pages4
JournalJournal of Applied Physics
Volume76
Issue number3
DOIs
Publication statusPublished - 1994

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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