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Film/substrate interactions and superconducting properties of Tl(Ba1−xSrx)2Ca2Cu3Oy thin films on (001) SrTiO3 and SrTiO3-buffered (001) MgO substrates

Published online by Cambridge University Press:  31 January 2011

A. P. Bramley ,
C. R. M. Grovenor ,
M. J. Goringe ,
J. D. O'Connor ,
A. P. Jenkins ,
D. Dew-Hughes ,
N. Reschauer ,
H. H. Wagner ,
W. Brozio  and
U. Spreitzer
...Show all authors
A. P. Bramley
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom
C. R. M. Grovenor
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom
M. J. Goringe
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom
J. D. O'Connor
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, OX1 3PJ, United Kingdom
A. P. Jenkins
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, OX1 3PJ, United Kingdom
D. Dew-Hughes
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, OX1 3PJ, United Kingdom
N. Reschauer
Affiliation:
Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany
H. H. Wagner
Affiliation:
Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany
W. Brozio
Affiliation:
Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany
U. Spreitzer
Affiliation:
Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany
K. F. Renk
Affiliation:
Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany
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Abstract

We have developed a process for the fabrication of (001) oriented SrTiO3 buffer layers onto (001) MgO substrates by rf magnetron sputtering followed by a post-deposition heat treatment in air. Precursor films with Tl :Ba : Ca : Cu ratio 2 : 2 : 2 : 3 were deposited by dc magnetron sputtering onto both these buffered substrates and directly onto (001) SrTiO3 single-crystal substrates, and thalliated at elevated temperatures. Because of Sr diffusion from the substrate/buffer layer, and its subsequent substitution for Ba in the superconducting film, the single Tl–O layer phase Tl(Ba1−xSrx)2Ca2Cu3Oy was stabilized. Diffusion of Ba and Ca in the opposite direction led to the formation of a Ba–Ca–Ti–O compound at the interface. The Tl(Ba1xSrx)2Ca2Cu3Oy films typically have superconducting transition temperatures (Tc's) > 103 K and critical current densities (Jc's) > 2.9 × 105 A cm−2 at 77 K. Rs values measured on these films and scaled to 10 GHz were 3.0 mΩ at 80 K and <200 µΩ at 50 K for the film grown on SrTiO3 buffered MgO, and 2.0 mΩ and 1.0 mΩ at 50 K for the film grown directly onto the (001) SrTiO3 substrate. Films fabricated on (001) SrTiO3 using an in situ deposition technique with a substrate temperature around 100 °C lower than the ex situ thalliation temperature showed no evidence of an interfacial reaction layer.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 8 , August 1998 , pp. 2057 - 2066
Copyright
Copyright © Materials Research Society 1998

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