Low-noise high-T/sub c/ DC SQUIDs at 77 K

Low-noise high-T/sub c/ DC SQUIDs at 77 K

Low-noise DC superconducting quantum interference devices (SQUIDs) have been fabricated using a reproducible superconductor-normal metal-superconductor (SNS) step-edge technique. The superconductor is YBa/sub 2/Cu/sub 3/O/sub 7-x/ and the normal metal is either Ag or an Ag-Au alloy. At 77 K, the ene...

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Veröffentlicht in:IEEE transactions on applied superconductivity 1993-03, Vol.3 (1), p.2011-2017
Hauptverfasser: Dilorio, M.S., Yoshizumi, S., Yang, K.-Y., Maung, M., Zhang, J., Power, B.
Format: Artikel
Sprache:eng
Schlagworte:
Coils
Copper alloys
Energy measurement
Inductance measurement
Interference
Noise measurement
SQUIDs
Superconducting device noise
Superconducting devices
Superconducting materials
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Zusammenfassung:Low-noise DC superconducting quantum interference devices (SQUIDs) have been fabricated using a reproducible superconductor-normal metal-superconductor (SNS) step-edge technique. The superconductor is YBa/sub 2/Cu/sub 3/O/sub 7-x/ and the normal metal is either Ag or an Ag-Au alloy. At 77 K, the energy sensitivity for the SQUIDs with the smallest inductance, L=12 pH, is below 9*10/sup -30/ J/Hz at 1 Hz. The energy sensitivity of SQUIDs with L=70 pH is 5*10/sup -29/ J/Hz at 1 Hz. These measured noise values are sufficient for many practical applications. The larger SQUID inductance is also adequate to permit coupling to multiturn input coils. Thin-film input coils with as many as 30 turns have been developed. Critical current densities for the multiturn coils routinely exceed 10/sup 6/ A/cm/sup 2/ at 77 K.< >
ISSN:1051-8223
1558-2515
DOI:10.1109/77.233462