YBaCuO input coils with low T sub c and high T sub c SQUIDs

Journal Article · Mon Jun 18 00:00:00 EDT 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.102846· OSTI ID:7154678

Oh, B; Koch, R H; Gallagher, W J; Foglietti, V; Koren, G; Gupta, A ^[1]; Lee, W Y ^[2]

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1. IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598 (USA)
2. IBM Research Division, Almaden Research Center, 560 Harry Road, San Jose, California 95120 (USA)

We have efficiently coupled single-level YBaCuO (YBCO) input coils to superconducting quantum interference devices (SQUIDs) using coils and SQUIDs made on separate substrates and sandwiched together. At 4.2 K, the coupling efficiency {alpha} to a low noise Nb-based SQUID was {similar to}0.76, with no increase in flux noise. At 77 K, the coupling efficiency of a YBCO coil to a TlBaCaCuO SQUID was {similar to}0.81. The magnetic field sensitivity of the coupled high {ital T}{sub {ital c}} SQUID at 77 K was 9 pT/{radical}Hz at 1000 Hz, a five times improvement compared to the bare SQUID.

• OSTI ID: 7154678
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 56:25; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
426001 -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
COUPLING
EFFICIENCY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
MAGNETIC FLUX
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SIGNAL-TO-NOISE RATIO
SQUID DEVICES
SUPERCONDUCTING COILS
SUPERCONDUCTING DEVICES
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES