caa a22 4500 388022426 CHVBK 20180307124928.0 cr unu---uuuuu 161130e199808 xx s 000 0 eng 10.1557/JMR.1998.0289 doi S0884291400045258 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0289 Film/substrate interactions and superconducting properties of Tl(Ba1−xSrx)2Ca2Cu3Oy thin films on (001) SrTiO3 and SrTiO3-buffered (001) MgO substrates [Elektronische Daten] 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. Copyright © Materials Research Society 1998 Bramley A. P. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom Grovenor C. R. M. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom Goringe M. J. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom O'Connor J. D. Department of Engineering Science, University of Oxford, Parks Road, OX1 3PJ, United Kingdom Jenkins A. P. Department of Engineering Science, University of Oxford, Parks Road, OX1 3PJ, United Kingdom Dew-Hughes D. Department of Engineering Science, University of Oxford, Parks Road, OX1 3PJ, United Kingdom Reschauer N. Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany Wagner H. H. Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany Brozio W. Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany Spreitzer U. Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany Renk K. F. Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany Journal of Materials Research Cambridge University Press 13/8(1998-08), 2057-2066 0884-2914 13:8<2057 1998 13 JMR https://doi.org/10.1557/JMR.1998.0289 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0289 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bramley A. P. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom NATIONALLICENCE 700 1- Grovenor C. R. M. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom NATIONALLICENCE 700 1- Goringe M. J. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom NATIONALLICENCE 700 1- O'Connor J. D. Department of Engineering Science, University of Oxford, Parks Road, OX1 3PJ, United Kingdom NATIONALLICENCE 700 1- Jenkins A. P. Department of Engineering Science, University of Oxford, Parks Road, OX1 3PJ, United Kingdom NATIONALLICENCE 700 1- Dew-Hughes D. Department of Engineering Science, University of Oxford, Parks Road, OX1 3PJ, United Kingdom NATIONALLICENCE 700 1- Reschauer N. Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany NATIONALLICENCE 700 1- Wagner H. H. Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany NATIONALLICENCE 700 1- Brozio W. Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany NATIONALLICENCE 700 1- Spreitzer U. Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany NATIONALLICENCE 700 1- Renk K. F. Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, 93040 Regensburg, Germany NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/8(1998-08), 2057-2066 0884-2914 13:8<2057 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge