YBa sub 2 Cu sub 3 O sub 7 minus x -Y sub 2 O sub 3 system and in situ deposition of trilayer heterostructures by coevaporation

Journal Article · Mon Dec 02 00:00:00 EST 1991 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.105785· OSTI ID:5997142

Ying, Q Y; Hilbert, C; Kumar, N; Eichman, D; Thompson, M; Kroger, H ^[1]; Hwang, D M ^[2]

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1. Computer Physics Laboratory, Microelectronics and Computer Technology Corporation (MCC), Austin, Texas (USA)
2. Bellcore, Red Bank, New Jersey (USA)

We have deposited YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}}-Y{sub 2}O{sub 3}-YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} heterostuctures by an {ital in} {ital situ} electron-beam coevaporation technique. Physical and chemical properties of Y{sub 2}O{sub 3} were studied. The deposition conditions for Y{sub 2}O{sub 3} and YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} are completely compatible. The crystal structure of Y{sub 2}O{sub 3} provides a close lattice match with YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} and allows oxygen diffusion through Y{sub 2}O{sub 3}, so that heteroepitaxy and the tetragonal-orthorhombic structural transformations of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} can be achieved. The heterostructures are therefore of high quality. Both the top and the bottom YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} layers are superconducting above 85 K. Tunneling phenomena on junctions fabricated from these trilayers were observed.

• OSTI ID: 5997142
• Journal Information: Applied Physics Letters; (United States), Vol. 59:23; ISSN 0003-6951
• Country of Publication: United States
• Language: English

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