Edge-geometry YBa sub 2 Cu sub 3 O sub 7 minus x /Au/Nb SNS devices

Conference · Fri Mar 01 00:00:00 EST 1991 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:5767055

Hunt, B D; Foote, M C; Bajuk, L ^[1]

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1. Center for Space Microelectronics Technology, Jet Propulsion Lab., California Inst. of Technology, Pasadena, CA (US)

This paper describes the fabrication and electrical properties of edge-geometry YBaCuO/Au/Nb weak links. Superconductor/normal-metal/superconductor (SNS) devices of this type serve as sensitive probes of the electrical quality of the YBaCuO/Au interface. For device applications, the edge geometry has the advantage of placing the critical N/S device interface on the longer coherence length a-b surface, and it simplifies the fabrication of weak links with submicron dimensions. These structures are fabricated using laser-ablated, in-situ, c-axis-oriented YBaCuO/Au interfaces. The YBaCuO film edges are patterned using ion milling, followed by a low energy ion cleaning step and in-situ deposition of Au and Nb. Devices with areas in the 10{sup {minus}7} to 10{sup {minus}8} cm{sup 2} range have been fabricated with R{sub n}A products lower than 10{sup {minus}8} {Omega}-cm{sup 2} and critical current densities up to 3 kA/cm{sup 2}. Josephson-coupling is verified by the observation of microwave steps under 10 GHz microwave irradiation. The best results have been obtained with annealed YBaCuO/Au interfaces.

• OSTI ID: 5767055
• Report Number(s): CONF-900944-; CODEN: IEMGA
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States), Vol. 27:2; Conference: 1990 applied superconductivity conference, Snowmass, CO (United States), 24-28 Sep 1990; ISSN 0018-9464
• Country of Publication: United States
• Language: English

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