Intrinsic high Josephson junctions in random-telegraph-noise fluctuators

G. Jung, B. Savo, A. Vecchione

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Bias current and magnetic field strongly influence the switching rates of random-telegraph signals by stressing the two-level fluctuator energy structure. Symmetric-telegraph noise is observed when the stress due to current flow is compensated by the magnetic-field-induced stress. The dependence of the measured symmetrizing magnetic field on current flow enables one to infer the symmetry characteristics of a fluctuator. The symmetry characteristics in granular films were found to be strongly nonlinear. It has been shown that current flow across the intrinsic Josephson inductance is responsible for the observed nonlinearity. A fit of the experimental data to the proposed model has revealed that a Josephson element enclosed in a superconducting loop is likely involved in the random-telegraph voltage noise generation. The evaluated area of the loop is consistent with the free space between average grains in the sample investigated.

Original languageEnglish
Pages (from-to)90-93
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume53
Issue number1
DOIs
StatePublished - 1 Jan 1996

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