섬유

cleaved surfaces of high t/sub c/ films for making sns structures

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 390
in exploring the feasibility of fabricating high t/sub c/ sns josephson junctions with well-defined and clean sn interfaces, the authors have cleaved epitaxial thin films of y-ba-cu-o and bi-sr-ca-cu-o of various crystal orientations in vacuum while the evaporation of a noble metal is taking place. the samples had structures which allowed them to form sns junctions in situ when the films were cleaved together with the substrate, with the area of the sn interfaces defined by the revealed cross-sectional edge surfaces of the films (typically 50 mu m/sup 2/). electrical measurements of the resulting junctions show that oxide/metal interfaces possess contact resistance in the order of 10/sup -9/ approximately 10/sup -8/(cm/sup 2/ which is at least two orders of magnitude larger than that of similarly made sn interfaces with metallic superconductors the nature of this interface and the factors influencing and giving rise to the contact resistance are discussed
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