Flux origin of random telegraph voltage signals in high-tc superconducting thin films

G. Jung, B. Savo, A. Vecchione

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Random telegraph voltage noise signals strongly dependent on externally applied magnetic field and transport current have been detected in c-axis-oriented BiSrCaCuO thin films at temperatures just below the onset of superconductivity. Signals appeared only in a narrow range of bias currents and associated magnetic fields. Such signals, already observed in granular YBaCuO films at helium temperatures, seem to be a universal feature of high-Tc superconducting films. Observed signals are consistently interpreted as an evidence of vortex hopping between two distinct pinning sites. Resistivity fluctuations and intrinsic SQUID detection are proposed as alternative mechanisms converting flux noise into random telegraph voltage signals.

Original languageEnglish
Pages (from-to)947-952
Number of pages6
JournalEurophysics Letters
Issue number9
StatePublished - 20 Mar 1993
Externally publishedYes


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