Low noise YBa2Cu3O7-δ grain boundary junction dc SQUIDs

R. Gross; P. Chaudhari; M. Kawasaki; M. B. Ketchen; A. Gupta

doi:10.1063/1.103600

Low noise YBa₂Cu₃O_7-δ grain boundary junction dc SQUIDs

R. Gross, P. Chaudhari, M. Kawasaki, M. B. Ketchen, A. Gupta

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Abstract

We have fabricated YBa₂Cu₃O_7-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.

Original language	English
Pages (from-to)	727-729
Number of pages	3
Journal	Applied Physics Letters
Volume	57
Issue number	7
DOIs	https://doi.org/10.1063/1.103600
State	Published - 1990
Externally published	Yes

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title = "Low noise YBa2Cu3O7-δ grain boundary junction dc SQUIDs",

abstract = "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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T1 - Low noise YBa2Cu3O7-δ grain boundary junction dc SQUIDs

AU - Gross, R.

AU - Chaudhari, P.

AU - Kawasaki, M.

AU - Ketchen, M. B.

AU - Gupta, A.

PY - 1990

Y1 - 1990

N2 - 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.

AB - 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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Low noise YBa₂Cu₃O_7-δ grain boundary junction dc SQUIDs

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