YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} trilayer junction with nm thick PrGaO{sub 3} barrier

Journal Article · Mon Sep 01 00:00:00 EDT 1997 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.119968· OSTI ID:542132

Tsuchiya, R; Kawasaki, M; Kubota, H; Nishino, J ^[1]; Sato, H; Akoh, H ^[2]; Koinuma, H ^[3]

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1. Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, Kanagawa 226 (Japan)
2. Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305 (Japan)
3. Materials and Structures Laboratory, Tokyo Institute of Technology and CREST-Japan Science and Technology Corporation, 4259 Nagatsuta, Midori, Yokohama, Kanagawa 226 (Japan)

We have established a deposition process of high quality a axis oriented YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} (a-YBCO) and insulating epitaxial PrGaO{sub 3} (PGO) films to fabricate a-YBCO/PGO(2.0{endash}3.2 nm)/a-YBCO trilayer junction. The precipitate formation on the bottom a-YBCO was greatly suppressed by the atomic layer modification of the substrate surface with a wet etching and successive atomic layer epitaxy of SrO and BaO atomic layers prior to the YBCO deposition. Crack formation and residual stress in the film due to the thermal expansion mismatch along c axis of YBCO could be eliminated by inserting a buffer layer of a-YBCO deposited with changing the substrate temperature from 580 to 735{degree}C. The junctions showed a clear hysteresis with its current jump as large as 30{percent}, together with the Fraunhofer diffraction. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 542132
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 11 Vol. 71; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
BARIUM COMPOUNDS
BARIUM OXIDES
COPPER OXIDES
DEPOSITION
ETCHING
GALLIUM OXIDES
HIGH-TC SUPERCONDUCTORS
MOLECULAR BEAM EPITAXY
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
PRECIPITATION
SUBSTRATES
SUPERCONDUCTING JUNCTIONS
THERMAL EXPANSION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES