YBaCuO BICRYSTAL JUNCTIONS AND DC SUPERCONDUCTING QUANTUM INTERFERENCE DEVICES

doi:10.1088/1004-423X/6/2/006

Abstract

Abstract We have prepared yttria-stabilized-zirconia bicrystal substrates using a simple hot-pressing method. The grain-boundary junctions have been fabricated with YBa₂Cu₃O₇ thin films grown epitaxially on the bicrystals. The patterns are defined by conventional photolithography, The dc and microwave characteristics of the junctiorts and the dc superconducting quantum interference devices (SQUIDs) have been intensively studied. The current-voltage curves are bridge-typed with noise rounding near the critical current. Resistive tail has been observed in the resistance versus temperature curves. The results are compared with the theoretical prediction for classical Josephson junctions. It is found that the behavior of bicrystal junctions can be described in the frame of classical theory. The deviations are attributed to the nonuniformity of the junctions. The small loop dc SQUIDs demonstrate diffraction and interference effects with regard to the applied magnetic field. A large square-washer with a new configuration has been designed to enhance the effective area of dc SQUID as a magnetometer. It has achieved a magnetic field resolution down to 1 pT/(Hz)^1/2(at 10Hz) at 77K.

Received: 09 February 1996
Revised: 23 April 1996
Accepted manuscript online:

PACS:	85.25.Dq	(Superconducting quantum interference devices (SQUIDs))
	61.72.Mm	(Grain and twin boundaries)
	74.78.Bz
	74.50.+r	(Tunneling phenomena; Josephson effects)
	81.20.Ev	(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
	74.25.Sv	(Critical currents)

Fund: Project supported by the National Center for R&D on Superconductivity and the Trans-Century Talent Foundation of the State Education Commission of China.

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WANG SHI-GUANG (王世光), DAI YUAN-DONG (戴远东), ZENG XIANG-HUI (曾祥辉), ZHENG PEI-HUI (郑培辉), CHEN MING-LING (陈名玲), WANG SHOU-ZHENG (王守证), XIONG GUANG-CHENG (熊光成), LIAN GUI-JUN (连贵君), GAN ZI-ZHAO (甘子钊) YBaCuO BICRYSTAL JUNCTIONS AND DC SUPERCONDUCTING QUANTUM INTERFERENCE DEVICES 1997 Acta Physica Sinica (Overseas Edition) 6 130

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YBaCuO BICRYSTAL JUNCTIONS AND DC SUPERCONDUCTING QUANTUM INTERFERENCE DEVICES

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