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Mocvd Routes To Thin Films For Superconducting Applications. Precursor Synthesis and Film Processing Issues

Published online by Cambridge University Press:  10 February 2011

T. J. Marks ,
J. A. Belot ,
B. J. Hinds ,
J. Chen ,
D. Studebaker ,
J. Lei ,
R. P. H. Chang ,
J. L. Schindler  and
C. R. Kannewurf
T. J. Marks
Affiliation:
Chemistry Department, T-MARKS@nwu.edu
J. A. Belot
Affiliation:
Chemistry Department, T-MARKS@nwu.edu
B. J. Hinds
Affiliation:
Chemistry Department, T-MARKS@nwu.edu
J. Chen
Affiliation:
Chemistry Department, T-MARKS@nwu.edu
D. Studebaker
Affiliation:
Chemistry Department, T-MARKS@nwu.edu
J. Lei
Affiliation:
Materials Science Department
R. P. H. Chang
Affiliation:
Materials Science Department
J. L. Schindler
Affiliation:
Electrical Engineering and Computer Science Department
C. R. Kannewurf
Affiliation:
Electrical Engineering and Computer Science Department
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Abstract

Low pressure metal-organic chemical vapor deposition has been used to grow dielectric thin films of the tetragonal perovskites LaSrGaO4 and PrSrGaO4 on (110) LaAlO3 using the volatile metal sources Pr(dpm) 3, La(hfa) 3•tri, Ga(dpm) 3, and Sr(hfa) 2•tet (dpm = dipivaloylmethanate, hfa = hexafluoroacetylacetonate, tet = tetraglyme, and tri = triglyme). The PrSrGaO4, a new ternary oxide, was found to have a body-centered tetragonal lattice with a = b = 3.80 and c = 12.59 Å. Epitaxial c-axis oriented growth of these materials has been revealed by both x-ray and electron diffraction, with an average surface roughness, measured by AFM, of 1.2 nm for LaSrGaO4 and 3.0 nm for PrSrGaO4. In addition to this, the ability of these materials to function as lattice-matched buffer layers for the growth of the high temperature superconductor YBa2Cu3O7−, has been explored. The superconductive properties of the YBCO layer do not indicate any degradation attributable to the buffer layers, with the onset of superconductivity displaying a sharp metal-superconductor transition at Tc = 87.3 K and 84.5 K for the LaSrGaO4 and PrSrGaO4 systems, respectively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 415: Symposium BB – Metal-Organic Chemical Vapor Deposition of Electronic Ceramics II , 1995 , 67
Copyright
Copyright © Materials Research Society 1996

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