Low-Noise YBa2Cu3O7 dc-SQUIDS and Magnetometers Using Step-Edge Junctions

Chin. Phys. Lett.

1997, Vol. 14

Issue (3): 233-236 DOI:

Original Articles

Low-Noise YBa₂Cu₃O₇ dc-SQUIDS and Magnetometers Using Step-Edge Junctions

NIE Jia-cai;CHEN Lie;YANG Tao;HUANG Ming-qiang;WU Pei-jun;LIU Gui-rong;LI Lin

National Laboratory for Superconductivity, Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080

Cite this article:

NIE Jia-cai, CHEN Lie, YANG Tao et al 1997 Chin. Phys. Lett. 14 233-236

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Abstract Superconducting quantum interference devices (SQUlDs) using YBa₂Cu₃O₇step-edge grain boundary junctions on LaAlO₃ substrates were fabricated. The I-V and V-Ф characteristics of these step-junction dc-SQUIDS were studied. A modulation voltage exceeding 16μV was attained with L_s = 60pH at 77K. At 77K, a square washer configuration with inductance L_s = 150pH yields flux noise of about 5.08 x 10^-5Ф₀/√Hz at frequencies above 100Hz, increasing to 1.1 x10^-4Ф₀/√Hz below 1 Hz. The corresponding magnetic field and energy resolution were 270 fT/√Hz and 3.68x10^-29J / Hz respectively, above 100 Hz, and increasing to 710 fT/√Hz and 1.8 x10^-28 J/Hz over a signal frequency range to below 1 Hz.

Keywords: 85.25.Dq 82.25.Cp 74.76.-w

Published: 01 March 1997

PACS:	85.25.Dq	(Superconducting quantum interference devices (SQUIDs))
	82.25.Cp
	74.76.-w

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y1997/V14/I3/0233

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	NIE Jia-cai
	CHEN Lie
	YANG Tao
	HUANG Ming-qiang
	WU Pei-jun
	LIU Gui-rong
	LI Lin

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