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

doi:https://doi.org/10.1063/1.346878

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

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Abstract

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.

Authors:

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

Publication Date:: 1990-12-15

OSTI Identifier:: 6225902

Resource Type:: Journal Article

Journal Name:: Journal of Applied Physics; (USA)

Additional Journal Information:: Journal Volume: 68:12; Journal ID: ISSN 0021-8979

Country of Publication:: United States

Language:: English

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

Citation Formats


                    Jia, Q X, Anderson, W A, Zheng, J P, Zhu, Y Z, Patel, S, Kwok, H S, and Shaw, D T. Characterization of the Ag/YBa sub 2 Cu sub 3 O sub 7 minus x contact in thin films.  United States: N. p., 1990. 
        Web.  doi:10.1063/1.346878.

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                    Jia, Q X, Anderson, W A, Zheng, J P, Zhu, Y Z, Patel, S, Kwok, H S, & Shaw, D T. Characterization of the Ag/YBa sub 2 Cu sub 3 O sub 7 minus x contact in thin films.  United States.  https://doi.org/10.1063/1.346878

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                    Jia, Q X, Anderson, W A, Zheng, J P, Zhu, Y Z, Patel, S, Kwok, H S, and Shaw, D T. Sat .  
        "Characterization of the Ag/YBa sub 2 Cu sub 3 O sub 7 minus x contact in thin films".  United States.  https://doi.org/10.1063/1.346878.

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@article{osti_6225902,

  title        = {Characterization of the Ag/YBa sub 2 Cu sub 3 O sub 7 minus x contact in thin films},

  author       = {Jia, Q X and Anderson, W A and Zheng, J P and Zhu, Y Z and Patel, S and Kwok, H S and Shaw, D T},

  abstractNote = {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.},

  doi          = {10.1063/1.346878},

  url          = {https://www.osti.gov/biblio/6225902},
  journal      = {Journal of Applied Physics; (USA)},

  issn         = {0021-8979},

  number       = ,

  volume       = 68:12,

  place        = {United States},

  year         = {1990},

  month        = {12}

}

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