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Microstructural Engineering via Fe Deficiency in Fe(Se, Te) Superconductors: A Pathway to Enhanced Vortex Pinning.

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Defect engineering in iron selenide telluride superconductors by introducing iron deficiency enhances flux pinning. This strategy improves critical current density and flux pinning forces, crucial for high-field applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Superconductivity

Background:

  • Defect engineering optimizes material properties by controlling structural imperfections.
  • Type-II superconductors benefit from defect-induced flux pinning centers, enhancing critical current density.
  • Fe(Se, Te) is a key material for superconducting applications, but its flux pinning needs improvement.

Purpose of the Study:

  • To engineer the microstructure of polycrystalline Fe(Se, Te) using strategic Fe deficiency.
  • To investigate the impact of Fe deficiency on flux pinning mechanisms and superconducting properties.
  • To demonstrate a method for enhancing high-field flux pinning in Fe(Se, Te) superconductors.

Main Methods:

  • Microstructure engineering via controlled Fe deficiency in Fe(Se, Te).
  • Analysis of nanoscale defect formation (Fe7(Se, Te)8) within the superconducting matrix.
  • Characterization of flux pinning forces and critical current density (Jc) at elevated temperatures.

Main Results:

  • Fe deficiency promotes the formation of nanoscale Fe7(Se, Te)8 defects, strengthening point pinning.
  • Reduced interstitial Fe restores intrinsic Δκ pinning by minimizing Se/Te compositional fluctuations.
  • Fe-deficient Fe(Se, Te) shows enhanced high-field flux pinning, evidenced by second magnetization peaks, higher Jc, and pinning forces.

Conclusions:

  • Strategic Fe deficiency effectively engineers beneficial pinning centers in Fe(Se, Te) superconductors.
  • This approach enhances high-field flux pinning and critical current density at elevated temperatures.
  • The study provides guidance for improving flux pinning in type-II superconductors for high-field applications.