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Superconducting and Semiconducting Thin films of La123 and123 and their Superlattices

Published online by Cambridge University Press:  28 February 2011

L. Ganapathi ,
Ashok Kumar ,
J. Narayan  and
O. W. Holland
L. Ganapathi
Affiliation:
Department of Materials Science and Engineering, North Carolina State University Raleigh, NC 27695-7916
Ashok Kumar
Affiliation:
Department of Materials Science and Engineering, North Carolina State University Raleigh, NC 27695-7916
J. Narayan
Affiliation:
Department of Materials Science and Engineering, North Carolina State University Raleigh, NC 27695-7916
O. W. Holland
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
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Abstract

Thin films of La123 and their superlattice with Y123 are deposited on various substrates for the first time. Thin films of La123 can be made semiconducting or superconducting within a small range of oxygen stoichiometry. A multiple target holder has been used for insitu processing of superlattice thin films. The ability of the La123 compound to exhibit either semiconductivity or superconductivity has been utilized to construct semiconductor / superconductor superlattice structures with Y123- X-ray diffraction studies have shown clearly the presence of two distinct type of layers in the superlattice films with a individual layer thickness of ∼ 120 and 300 Å, although this did not happen for ∼ 24 Å thickness of the individual layers. Rutherford backscattering experiments showed good quality of the films with channeling yields < 10%. Resistivity measurements showed a Tc (onset) = 90 K and Tc(zero) = 85 K for the La123 as well as superlattice thin films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 561
Copyright
Copyright © Materials Research Society 1990

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