Self-induced structure in the current-voltage characteristics of RSQUIDs

Colin M. Pegrum, John C. MacFarlane

Research output: Contribution to journalArticle

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Abstract

Resistive two-junction SQUIDs (RSQUIDs) made from high-temperature superconductors are being developed as narrow-linewidth tunable oscillators in the GHz frequency range. We present here the results of numerical simulation of RSQUIDs of this type. These studies have identified conditions where sub-harmonic steps and other features are apparent in the current-voltage characteristics, driven by the internally-generated heterodyne frequency. The behavior is sensitive to the frequency (set by the voltage across the resistive element in the RSQUID), the temperature and also the loop inductance. We have studied the effects of thermal noise on these features. We also assess how these effects might be observed, and consider how they might affect practical applications of high frequency heterodyne RSQUID oscillators.
Original languageEnglish
Pages (from-to)778-781
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume19
Issue number3
DOIs
Publication statusPublished - 30 Jun 2009

Fingerprint

SQUIDs
Current voltage characteristics
electric potential
oscillators
Thermal noise
High temperature superconductors
thermal noise
inductance
high temperature superconductors
Inductance
Linewidth
frequency ranges
harmonics
Computer simulation
Electric potential
simulation
Temperature
temperature

Keywords

  • heterodyning
  • josephson oscillators
  • SQUIDs
  • superconducting devices
  • high temperature superconductors
  • thermal noise

Cite this

Pegrum, Colin M. ; MacFarlane, John C. / Self-induced structure in the current-voltage characteristics of RSQUIDs. In: IEEE Transactions on Applied Superconductivity . 2009 ; Vol. 19, No. 3. pp. 778-781.
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Self-induced structure in the current-voltage characteristics of RSQUIDs. / Pegrum, Colin M.; MacFarlane, John C.

In: IEEE Transactions on Applied Superconductivity , Vol. 19, No. 3, 30.06.2009, p. 778-781.

Research output: Contribution to journalArticle

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