Characterization of the Ag/YBa sub 2 Cu sub 3 O sub 7 minus x contact in thin films

Journal Article · Fri Dec 14 23:00:00 EST 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.346878· OSTI ID:6225902

Jia, Q X; Anderson, W A; Zheng, J P; Zhu, Y Z; Patel, S; Kwok, H S; Shaw, D T ^[1]

---

1. Department of Electrical and Computer Engineering, State University of New York at Buffalo, Buffalo, NY (USA) Institute on Superconductivity, Bonner Hall, Amherst, NY (USA)

Silver (Ag) contacts to very thin superconducting YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} films were prepared by thermal evaporation. The nature of the Ag/YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} contact during thermal treatment was {ital in} {ital situ} investigated by a combination of three- and four-terminal resistance measurements. The experimental results suggested that the interaction between Ag and the YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} film began at a temperature of around 370 {degree}C. The contact resistance measurement for different films also demonstrated that the contact property was a strong function of the film quality and surface conditions. The lack of reproducibility in forming a low-resistance contact to very thin YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} films and the high probability of degrading the film quality after thermal treatment of the contact might be due to the excess Ag doping in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}}. Ag island formation, as revealed by scanning electron microscopy after thermal treatment of the contact, is a limitation of Ag for use as a good contact electrode for very thin superconducting films.

• OSTI ID: 6225902
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 68:12; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
426001 -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRIC CONTACTS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELEMENTS
EQUIPMENT
FILMS
HIGH-TC SUPERCONDUCTORS
JUNCTIONS
METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SILVER
SUPERCONDUCTING FILMS
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES