Noise properties of dc-SQUID with quasiplanar YBa2Cu3O7 Josephson junctions

M.I. Faley, U. Poppe, K. Urban, H. Hilgenkamp, H. Hemmes, W. Aarnink, J. Flokstra, H. Rogalla

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Abstract

We describe the noise performance of dc SQUIDs fabricated with quasiplanar ramp‐type Josephson junctions on the basis of c‐axis‐oriented YBa2Cu3O7/PrBa2Cu3O7 thin‐film heterostructures. The noise spectrum of the dc SQUIDs was measured with dc‐ and ac‐bias schemes at different temperatures and showed values below 10−5 Φ0/Hz1/2 down to frequencies of about 1 Hz at 70 K. Up to now for the magnetic fluxnoise and the energy resolution obtained at 1 kHz and 77 K the best values were 2.5×10−6, Φ0/Hz1/2 and 3×10−31 J/Hz, respectively. A study of the white and 1/fnoises of the SQUIDs was performed. The influence of magnetic flux, bias current, high static magnetic fields, and aging on the SQUID noise were investigated. The junctions and devices do not degrade due to aging in air or thermal cycling.
Original languageEnglish
Pages (from-to)2087-2089
Number of pages3
JournalApplied physics letters
Volume67
Issue number14
DOIs
Publication statusPublished - 1995

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