In situ preparation and transport properties of YBa sub 2 Cu sub 3 O sub 7 films on sapphire with Zr(Y)O sub 2 buffer layers

Journal Article · Sun Dec 01 00:00:00 EST 1991 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.349819· OSTI ID:5160947

Adrian, G; Grabe, G; Wilkens, W ^[1]; Adrian, H; Huth, M; Walkenhorst, A ^[2]

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1. Daimler Benz AG, Research Institute, Frankfurt (Federal Republic of Germany)
2. Institute for Solid State Physics, Technical University, Darmstadt (Federal Republic of Germany)

YBa{sub 2}Cu{sub 3}O{sub 7} films on sapphire substrates prepared by laser ablation show {ital c}-axis-oriented growth and critical temperatures as high as {ital T}{sub {ital c}}({ital R}=0)=90 K. Due to diffusion processes and the formation of a nonsuperconducting intermediate layer the critical current density {ital J}{sub {ital c}} is comparatively low. To overcome these difficulties the sapphire substrates were covered by Zr(Y)O{sub 2} films acting as diffusion barriers. The preparation of these films was performed by laser ablation using a multitarget system. The structure and the surfaces of the films were characterized by x-ray diffraction and scanning electron microscopy, respectively. The transport properties of the superconductor films are similar to those on suited substrates. Critical current densities up to {ital J}{sub {ital c}} (77 K)=5{times}10{sup 5} A/cm{sup 2} were achieved. In order to gain information about the pinning mechanisms measurements of the dependencies of {ital J}{sub {ital c}} on the orientation between the crystal {ital c} axis and the external magnetic fields were carried out using samples with different buffer layer thicknesses. From the received data no indication of pinning by point defects in addition to the intrinsic planar pinning mechanism was detected.

• OSTI ID: 5160947
• Journal Information: Journal of Applied Physics; (United States), Vol. 70:11; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
ABLATION
COPPER OXIDES
SUPERCONDUCTING FILMS
CRITICAL CURRENT
YTTRIUM OXIDES
CRYSTAL STRUCTURE
HIGH-TC SUPERCONDUCTORS
QUATERNARY COMPOUNDS
ZIRCONIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CURRENTS
ELECTRIC CURRENTS
FILMS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties