DC SQUID in YBaCuO ceramics operating at 77 K

Author

Sing, M. L Chok ; Robbes, D. ; Monfort, Y. ; Bloyet, D. ; Provost, J. ; Raveau, B.

Author_Institution

ISMRa, Caen, France

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

889

Lastpage

892

Abstract

Constrictions with typical cross-sectional areas of 10^-8-10^-7 m² engraved in bulk YBa₂Cu₃O_7-d ceramics operate as DC SQUIDs (superconducting quantum interference devices) at 77 K. These sensors have a magnetic field sensitivity of 1 to 20 pT/√Hz, a flux sensitivity of 6×10^-6 to 3×10^-5 φ ₀/√Hz, and a corresponding energy resolution in the 10 ^-30-10^-29 J/Hz range around 20 kHz. The noise spectral density of the device clearly exhibits low-frequency 1/f noise, which scales throughout the whole investigated range of frequencies. The noise spectra at 1 Hz varies between 5×10^-27 and 2×10^-26 J/Hz

Keywords

SQUIDs; barium compounds; electric sensing devices; electron device noise; high-temperature superconductors; magnetic field measurement; random noise; yttrium compounds; 77 K; DC SQUIDs; YBa₂Cu₃O_7-d; ceramics; cross-sectional areas; energy resolution; flux sensitivity; high temperature superconductor; low-frequency 1/f noise; magnetic field sensitivity; noise spectra; noise spectral density; Ceramics; Energy resolution; Frequency; Interference; Low-frequency noise; Magnetic sensors; SQUIDs; Superconducting device noise; Superconducting devices; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92429

Filename

92429