Low-Noise YBa2 Cu3 O7 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
Low-Noise YBa2 Cu3 O7 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
关键词 ：
85.25.Dq ,
82.25.Cp ,
74.76.-w
Abstract ： Superconducting quantum interference devices (SQUlDs) using YBa2 Cu3 O7 step-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 Ls = 60pH at 77K. At 77K, a square washer configuration with inductance Ls = 150pH yields flux noise of about 5.08 x 10-5 Ф0 /√Hz at frequencies above 100Hz, increasing to 1.1 x10-4 Ф0 /√Hz below 1 Hz. The corresponding magnetic field and energy resolution were 270 fT/√Hz and 3.68x10-29 J / 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.
Key words ：
85.25.Dq
82.25.Cp
74.76.-w
出版日期: 1997-03-01
引用本文:
NIE Jia-cai;CHEN Lie;YANG Tao;HUANG Ming-qiang;WU Pei-jun;LIU Gui-rong;LI Lin. Low-Noise YBa2 Cu3 O7 dc-SQUIDS and Magnetometers Using Step-Edge Junctions[J]. 中国物理快报, 1997, 14(3): 233-236.
2 Cu3 O7 dc-SQUIDS and Magnetometers Using Step-Edge Junctions. Chin. Phys. Lett., 1997, 14(3): 233-236.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y1997/V14/I3/233
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