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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

  • A. P. Bramley (a1), C. R. M. Grovenor (a1), M. J. Goringe (a1), J. D. O'Connor (a2), A. P. Jenkins (a2), D. Dew-Hughes (a2), N. Reschauer (a3), H. H. Wagner (a3), W. Brozio (a3), U. Spreitzer (a3) and K. F. Renk (a3)...

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.

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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

  • A. P. Bramley (a1), C. R. M. Grovenor (a1), M. J. Goringe (a1), J. D. O'Connor (a2), A. P. Jenkins (a2), D. Dew-Hughes (a2), N. Reschauer (a3), H. H. Wagner (a3), W. Brozio (a3), U. Spreitzer (a3) and K. F. Renk (a3)...

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