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High-performance Fe(Se,Te) films on chemical CeO2-based buffer layers.

L Piperno1, A Vannozzi2, A Augieri2

  • 1ENEA, Frascati Research Centre, Via E. Fermi, 45, 00044, Frascati, Italy. laura.piperno@enea.it.

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Fe-based coated conductors (CCs) offer a simplified architecture for high-performance superconducting wires. This study demonstrates their feasibility using a CeO2 buffer layer and a Fe(Se,Te) seed layer, achieving excellent superconducting properties.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Superconductivity

Background:

  • Fabricating iron-based coated conductors (CCs) requires epitaxial growth of Fe(Se,Te) on metallic substrates.
  • The low structural anisotropy of Fe(Se,Te) allows for a simplified CC architecture compared to REBCO.
  • A buffer layer is crucial for oriented growth and preventing diffusion from the metallic template.

Purpose of the Study:

  • To investigate the growth of Fe(Se,Te) films on CeO2-based buffer layers using pulsed laser deposition.
  • To evaluate the effect of a Fe(Se,Te) seed layer on the superconducting properties of the films.
  • To demonstrate the feasibility of a simplified Fe-based CC architecture.

Main Methods:

  • Pulsed laser deposition (PLD) for growing Fe(Se,Te) films.
  • Chemical deposition of CeO2-based buffer layers.
  • Transmission electron microscopy (TEM) for film characterization.
  • Comprehensive measurement of current transport properties (J(θ, H, T)).

Main Results:

  • Excellent Fe(Se,Te) film properties were achieved using a Fe(Se,Te) seed layer on CeO2-based buffer layers.
  • Transmission electron microscopy revealed the seed layer's critical role in film quality.
  • Superconducting transitions occurred around 16 K with critical current densities exceeding 1 MA/cm² at 4.2 K in self-field.
  • In-field and angular behaviors were consistent with literature data.

Conclusions:

  • The use of a Fe(Se,Te) seed layer significantly enhances the properties of Fe(Se,Te) films grown on CeO2-based buffer layers.
  • These findings demonstrate the practical feasibility of fabricating simplified, cost-effective Fe-based coated conductors.
  • The developed approach offers advantages in process simplification and cost reduction for superconducting wire production.