NDLI: Surface study and fabrication of low-resistivity contacts on Cu-1234 superconductor

Content Provider	IEEE Xplore Digital Library
Author	Terada, N. Iyo, A. Ihara, H. Tokiwa, K. Ozawa, H.
Copyright Year	2002
Abstract	The surface nature of CuBa/sub 2/Ca/sub 3/Cu/sub 4/O/sub 12-/spl delta// (Cu-1234) superconducting ceramics has been characterized by photoemission spectroscopy, and an improvement of their surface electronic structure for high performance contacts has been attempted, In photoemission spectra of the specimens which had been scraped by a diamond file in vacuum, a shift of Ba core signals towards the higher binding energy side and reduction of valency of Cu were observed. This indicates that the surfaces of the conventionally treated Cu-1234 should easily lose oxygen from the vicinity of (BaO)/(CuO/sub 2-y/)/(BaO) blocks. Due to this degradation, a high contact resistivity was observed on interfaces between Au and such surfaces. The annealing in ultra-high vacuum at a low temperature below 150/spl deg/C under atomic oxygen or O/sub 3/ beams developed an intrinsic surface-electronic-structure. Due to the treatment, contact resistivity as low as 1/spl times/10/sup 18/ /spl Omega/ cm/sup 2/ was reproducibly achieved.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2157
Ending Page	2160
Page Count	4
File Size	427043
File Format	PDF
ISSN	10518223
Volume Number	7
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fabrication Surface treatment Photoelectricity Conductivity Ceramics Spectroscopy Elementary particle vacuum Degradation Gold Annealing
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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