Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Structural suitability of GdFeO3 as a magnetic buffer layer for GdBa2Cu3O7-x superconducting thin films

  • Park, H.S. (Department of Physics, Chungbuk National University) ;
  • Oh, J.Y. (Department of Physics, Chungbuk National University) ;
  • Song, B.H. (Department of Physics, Chungbuk National University) ;
  • Kang, B. (Department of Physics, Chungbuk National University)
  • Received : 2021.05.24
  • Accepted : 2021.06.03
  • Published : 2021.06.30
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Abstract

We investigated the structural suitability of GdFeO3 (GdFO) as a buffer layer for the GdBa2xCu3O7-x (GdBCO) superconducting films. GdFO films with different thicknesses and GdBCO thin films were all prepared by using a pulsed laser deposition technique. The analyses of X-ray diffraction and EXAFS data indicates that the c-axis parameter increases and the Fe-O bond length decreases with the GdFO thickness due to the compressive stain induced by the lattice mismatch between GdFO and STO substrate and as a result, the Debye-Waller factor, an index of disorder in the local structure near the Fe-O bond, increases with the GdFO thickness. However, for the GdBCO/GdFO bilayer structure, the Debye-Waller factor decreases as the GdFO thickness increases indicating a diminished disorder by the structural coupling between GdFO and GdBCO. These results indicate that an appropriate thickness of GdFO is required to be utilized as a magnetic buffer layer for the GdBCO superconducting films.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (NRF-2018R1A2B6004784).

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