Pair suppression caused by mosaic-twist defects in superconducting Sr2RuO4 thin-films prepared using pulsed laser deposition

Carla Maria Palomares Garcia, Angelo Di Bernardo, Graham Kimbell, Mary E. Vickers, Fabien C-P. Massabuau, Sachio Komori, Giorgio Divitini, Yuuki Yasui, Han Gyeol Lee, Jinkwon Kim, Bongju Kim, Mark G. Blamire, Antonio Vecchione, Rosalba Fittipaldi, Yoshiteru Maeno, Tae Won Noh, Jason W. A. Robinson

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Abstract

Sr2RuO4 is a prototypical unconventional superconductor, but the superconducting symmetries of the bulk and surface states in single crystals remains controversial. Solving this problem is impeded by the challenge of producing thin-films of Sr2RuO4 free of defects and impurities which annihilate the superconductivity. Here, we report the reliable growth of superconducting Sr2RuO4 thin-films by pulsed laser deposition and identify the universal material properties that are destructive to the superconducting state. We demonstrate that careful control of the starting material is essential to achieve superconductivity as well as the use of a single crystal target of Sr3Ru2O7. By systematically varying the Sr2RuO4 film thickness, we identify mosaic twist as the key in-plane defect that suppresses superconductivity. These results are central to the development of our understanding of unconventional superconductivity.
Original languageEnglish
Article number23
Number of pages8
JournalCommunications Materials
Volume1
DOIs
Publication statusPublished - 6 May 2020

Keywords

  • superconductor
  • Sr2RuO4
  • thin film

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Palomares Garcia, C. M., Di Bernardo, A., Kimbell, G., Vickers, M. E., Massabuau, F. C-P., Komori, S., Divitini, G., Yasui, Y., Gyeol Lee, H., Kim, J., Kim, B., Blamire, M. G., Vecchione, A., Fittipaldi, R., Maeno, Y., Won Noh, T., & Robinson, J. W. A. (2020). Pair suppression caused by mosaic-twist defects in superconducting Sr2RuO4 thin-films prepared using pulsed laser deposition. Communications Materials, 1, [23]. https://doi.org/10.1038/s43246-020-0026-1