Measurement of the dynamic input impedance of a dc superconducting quantum interference device at audio frequencies

Journal Article · Fri Aug 01 00:00:00 EDT 1997 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.119700· OSTI ID:538368

Falferi, P ^[1]; Mezzena, R; Vitale, S ^[2]; Cerdonio, M ^[3]

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1. Centro di Fisica degli Stati Aggregati and INFN, Gruppo Collegato di Trento, Sezione di Padova, I-38050 Povo, Trento (Italy)
2. Dipartimento di Fisica, Universita di Trento and INFN, Gruppo Collegato di Trento, Sezione di Padova, I-38050 Povo, Trento (Italy)
3. Dipartimento di Fisica, Universita di Padova and INFN, Sezione di Padova, via Marzolo 8, I-35131, Padova (Italy)

The coupling effects of a commercial dc superconducting quantum interference device (SQUID) to an electrical LC resonator which operates at audio frequencies ({approx}1kHz) with quality factors Q{approx}10{sup 6} are presented. The variations of the resonance frequency of the resonator as functions of the flux applied to the SQUID are due to the SQUID dynamic inductance in good agreement with the predictions of a model. The variations of the quality factor point to a feedback mechanism between the output of the SQUID and the input circuit. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 538368
• Journal Information: Applied Physics Letters, Vol. 71, Issue 7; Other Information: PBD: Aug 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
SQUID DEVICES
IMPEDANCE
RESONATORS
KHZ RANGE 01-100
MAGNETIC FLUX
QUALITY FACTOR
GRAVITATIONAL WAVE DETECTORS