II. Applications of the Josephson Effect

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R. Gross, A. Marx, and F. Deppe © Walther-Meißner-Institut (2001 - 2013) AS-Chap. 4 - 28 4.1.4 Practical dc-SQUIDs high-T c dc-SQUIDs: - heteroepitaxial growth of the different SC layers - low reproducibility of junctions - alternatives: flip-chip design, directly coupled SQUID (only 1 SC layer required)
R. Gross, A. Marx, and F. Deppe © Walther-Meißner-Institut (2001 - 2013) AS-Chap. 4 - 29 4.1.5 Read-Out Schemes • flux-locked loop operation - hVi(F ext ) curve is nonlinear - linearization by feedback circuit linear input – output relation - oscillating flux, amplitude F 0 /2 - f mod ≈ 100 kHz – several MHz • quasistatic flux = nF 0 : rectified input 2f mod component lock-in detection at f mod zero • quasistatic flux = (n+1/4) F 0 : maximum lock-in output signal • detection of ac voltage: cooled transformer: SQUID impedance matching: R d N 2 R d low-noise preamplifier
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II. Applications of the Josephson Effect

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