LOW-NOISE YBA2CU3O7-DELTA GRAIN-BOUNDARY JUNCTION DC SQUIDS

被引：206
作者：
GROSS, R
CHAUDHARI, P
KAWASAKI, M
KETCHEN, MB
GUPTA, A
机构：
来源：
APPLIED PHYSICS LETTERS | 1990年 / 57卷 / 07期
关键词：
D O I：
10.1063/1.103600
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have fabricated YBa2Cu3O7-δ grain boundary junction dc superconducting quantum interference devices (SQUIDs) with a square washer geometry design. The SQUIDs were formed in c-axis oriented epitaxial films with a single grain boundary of predetermined nature. These SQUIDs show perfectly periodic voltage-flux characteristics without hysteresis from 4.2 to 87 K. At 77 K intrinsic energy sensitivities of 1.5×10 -30 and 3.0×10-30 J/Hz at 10 kHz were obtained for 60 and 110 pH SQUIDs, respectively. The intrinsic energy sensitivity limited by 1/f noise at 10 Hz was 1.2×10-28 and 5.5×10-28 J/Hz. The SQUID voltage noise was found to be almost identical to the voltage noise from one of its junctions. The flux focusing effect of the washer geometry was also measured.
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页码：727 / 729
页数：3
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