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<p>In this study, a novel iron-based high-entropy superconductor with hole-type doping was synthesized and characterized. The compound with the nominal composition (Ba<sub>0.2</sub>Sr<sub>0.2</sub>Na<sub>0.2</sub>K<sub>0.2</sub>Rb<sub>0.2</sub>)Fe<sub>2</sub>As<sub>2</sub> was obtained by the mechanical alloying method. The lattice parameters of the synthesized compound were determined and uniform distribution of the elements was confirmed. Magnetic susceptibility measurements revealed bulk superconductivity with a critical transition temperature T<sub>C</sub> = 10.5 K. From the temperature dependencies χ'(T) measured in various external magnetic fields up to 9 T, the upper critical field for this compound was estimated with different models, yielding a coherence length in the range of 3.4–4.8 nm.</p>

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Novel high-entropy iron-based superconductor (Ba0.2Sr0.2Na0.2K0.2Rb0.2)Fe2As2

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • A. D. Denishchenko,
  • V. A. Vlasenko,
  • A. Yu. Tsvetkov,
  • K. S. Pervakov

摘要

In this study, a novel iron-based high-entropy superconductor with hole-type doping was synthesized and characterized. The compound with the nominal composition (Ba0.2Sr0.2Na0.2K0.2Rb0.2)Fe2As2 was obtained by the mechanical alloying method. The lattice parameters of the synthesized compound were determined and uniform distribution of the elements was confirmed. Magnetic susceptibility measurements revealed bulk superconductivity with a critical transition temperature TC = 10.5 K. From the temperature dependencies χ'(T) measured in various external magnetic fields up to 9 T, the upper critical field for this compound was estimated with different models, yielding a coherence length in the range of 3.4–4.8 nm.