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We discovered full-gap superconductivity in a barium arsenide (BaAs) monolayer on a ferropnictide substrate. This emergent superconductivity is robust, even at the monolayer limit, offering new insights into high-temperature phenomena.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Interfacial interactions in 2D systems can lead to unusual phenomena like high-temperature superconductivity.
  • Ferropnictide materials, such as Ba(Fe_{1-x}Co_{x})_{2}As_{2} (BFCA), are known for their superconducting properties.
  • Standalone BFCA thin films show rapid suppression of critical temperature (Tc) with reduced thickness.

Purpose of the Study:

  • To investigate superconductivity in a BaAs monolayer grown on BFCA epitaxial films.
  • To understand the role of interfacial interactions and heterostructure crystallinity on superconductivity.
  • To explore the robustness of superconductivity against reduced substrate thickness.

Main Methods:

  • Epitaxial growth of BaAs monolayer on BFCA films.
  • Spectroscopic measurements to determine superconducting properties.
  • Analysis of heterostructure crystallinity, electronic, and geometric uniformity.

Main Results:

  • Observation of full-gap superconductivity in BaAs/BFCA heterostructures with a maximal spectroscopic temperature up to 26 K.
  • Superconducting gap robustness even when the underlying BFCA is reduced to a monolayer.
  • Correlation between exceptional heterostructure crystallinity and emergent superconductivity.

Conclusions:

  • Exceptional crystallinity and uniformity of BaAs/BFCA heterostructures are crucial for robust, full-gap superconductivity.
  • The observed superconductivity exhibits mean-field temperature dependence and bound states within magnetic vortices.
  • Findings advance the understanding of unconventional superconductivity in ferropnictides and FeAs-based heterostructures.