Telegraph-like noise in Y-Ba-Cu oxide thin-film dc SQUID’s

Matsuda, M.; Kuriki, S.
August 1988
Applied Physics Letters;8/15/1988, Vol. 53 Issue 7, p621
Academic Journal
We have observed a telegraph-like noise in dc superconducting quantum interference devices (SQUID’s) made of low-temperature synthesized superconducting Y-Ba-Cu oxide thin films. The voltage of the SQUID jumps among two to four discrete levels randomly with time, and exhibits a Lorentzian type frequency dependence in the power spectrum. Periodic modulations of the voltage with magnetic flux are observed in a SQUID having narrow bridges of submicrometer width. The flux noise of the SQUID is dominated by the telegraph-like noise at low frequencies.


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