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

doi:10.1063/1.357714

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 Institute of Electrical Communication (RIEC)

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

We have studied low frequency (1/f) noise of YBa₂Cu ₃O_7-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 language	English
Pages (from-to)	1895-1898
Number of pages	4
Journal	Journal of Applied Physics
Volume	76
Issue number	3
DOIs	https://doi.org/10.1063/1.357714
Publication status	Published - 1994

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.357714

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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.",

author = "J. Chen and T. Ogawa and H. Nakamura and H. Myoren and K. Nakajima and T. Yamashita",

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T1 - Low frequency (1/f) noise in YBa2Cu3O 7-δ grain boundary junction dc superconducting quantum interference devices

AU - Chen, J.

AU - Ogawa, T.

AU - Nakamura, H.

AU - Myoren, H.

AU - Nakajima, K.

AU - Yamashita, T.

PY - 1994

Y1 - 1994

N2 - 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.

AB - 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.

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Low frequency (1/f) noise in YBa₂Cu₃O _7-δ grain boundary junction dc superconducting quantum interference devices

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