Characterization of bilayer-metal contacts to high T sub c superconducting films

Journal Article · Wed May 01 04:00:00 EDT 1991 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA)

DOI:https://doi.org/10.1116/1.577419· OSTI ID:5562225

Ma, Q Y; Schmidt, M T; Weinman, L S; Yang, E S ^[1]; Sampere, S M; Chan, S ^[2]

---

1. Microelectronics Sciences Labs and Center for Telecommunications Research, Columbia University, New York, New York 10027 (USA)
2. Bell Communications Research, Red Bank, New Jersey 07701 (USA)

Low resistivity normal metal contacts to YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital 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 near {ital T}{sub {ital c}} of 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 A 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.

• OSTI ID: 5562225
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA) Vol. 9:3; ISSN 0734-2101; ISSN JVTAD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRIC CONTACTS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTRON SPECTROSCOPY
ELEMENTS
EQUIPMENT
FILMS
GOLD
HIGH-TC SUPERCONDUCTORS
LAYERS
METALS
NIOBIUM
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PHYSICAL PROPERTIES
SPECTROSCOPY
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES