LOW-NOISE HIGH-T-c DC SQUIDS AT 77 K

被引：0
|
作者：
DiIorio, M. S. [1 ]
Yoshizumi, S. [1 ]
Yang, K-Y. [1 ]
Maung, M. [1 ]
Zhang, J. [1 ]
Power, B. [1 ]
机构：
[1] Biomagnet Technol, 9727 Pacific Hts Blvd, San Diego, CA 92121 USA
来源：
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1993年 / 3卷 / 01期
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D O I：
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中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We have fabricated low-noise dc SQUIDs using a reproducibles uperconductor-normal metal-superconductor(SNS) step-edge technique. The superconductor is YBa2Cu3O7-x and the normal metal is either Ag or a Ag-Au alloy. At 77 K, the energy sensitivity for the SQUIDs with the smallest inductance, L = 12 pH, reaches below 9 x 10(-30) J/Hz at 1 Hz. The energy sensitivity for SQUIDs with L = 70 pH, is 5 x 10(-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 multi-turn input coils. Thin-film input coils with as many as 30 turns have been developed. Critical current densities for the multi-turn coils routinely exceed 10(6) A/cm(2) at 77 K.
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页码：2011 / 2017
页数：7
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