Sr2AlTaO6/ YBa2Cu3O7 Heterostructures for Superconducting Device Applications

A. T. Findikoglu, S. Bhattacharya, C. Doughty, M. S. Pambianchi, Qi Li, X. X. Xi, S. M. Anlage, R. E. Fahey, A. J. Strauss, Julia M. Phillips, T. Venkatesan

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9 Scopus citations


Using pulsed laser deposition, we have prepared epitaxial heterostructures of a new insulating perovskite Sr2AlTaO6 (SAT) and the high temperature superconductor YBa2Cu3O7 (YBCO) on LaA103 substrates. X-ray rocking curve and Rutherford backscattering channelling measurements on [001] SAT films on [001] LaA103 substrates yield full width at half-maximum of < 0.3° and minimum backscattering yield xmin of 5 %, respectively, indicating good crystallinity. From capacitance measurements on SAT films, the real part of the relative dielectric constant er is found to be ~ 23 - 30, with ~ 6xl07 V/m static breakdown electric field. A 100 nm x 10 |im x 50 |am YBCO film on SAT shows zero-field critical current density of ~ 1.3xl06 A/cm2 at 77 K. Using a dielectric resonator at 24.5 GHz, we have measured the resistive energy dissipation at the surface of a YBCO/SAT/YBCO trilayer, yielding effective surface resistance value of ~ 12 mQ, at 77 K, which is within a factor of four of the value obtained for a single layer YBCO film.

Original languageEnglish (US)
Pages (from-to)1425-1428
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1
StatePublished - Mar 1993

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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