Characterization of bilayer‐metal contacts to highTcsuperconducting films
作者:
Q. Y. Ma,
M. T. Schmidt,
L. S. Weinman,
E. S. Yang,
S. M. Sampere,
Siu‐Wai Chan,
期刊:
Journal of Vacuum Science&Technology A: Vacuum, Surfaces, and Films
(AIP Available online 1991)
卷期:
Volume 9,
issue 3
页码: 390-393
ISSN:0734-2101
年代: 1991
DOI:10.1116/1.577419
出版商: American Vacuum Society
关键词: YTTRIUM OXIDES;BARIUM OXIDES;COPPER OXIDES;SUPERCONDUCTING FILMS;HIGH−TC BARIUM OXIDES;COPPER OXIDES;SUPERCONDUCTING FILMS;HIGH−TC SUPERCONDUCTORS;METALS;ELECTRIC CONTACTS;ELECTRIC CONDUCTIVITY;GOLD;NIOBIUM;LAYERS;PHOTOELECTRON SPECTROSCOPY;YBa2Cu3O7
数据来源: AIP
摘要:
Low resistivity normal metal contacts to YBa2Cu3O7−x(YBCO) films have been investigated. It has previously shown that the contact resistivity of Au contact exhibits a strong temperature dependence, decreasing 2–3 orders of magnitude at a transition temperature nearTcof YBCO film. Other metal contacts, including Pd and Nb, do not show this effect. The contact resistivity of metal contacts has been correlated with interfacial reactions and disruption studied by x‐ray photoelectron spectroscopy (XPS). In this work we demonstrate that a thin interlayer, specifically 10 Å of Au, between the YBCO and a metal contact such as Nb can allow the formation of a low resistance contact. XPS of the effect of the interlayer is presented, and the implications for carrier coupling are discussed. These results indicate a methodology for low contact resistance bilayer‐metal structures for supercondcuting device applications.
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