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Improving Superconducting Performance of Fe(Se, Te) with in Situ Formed Grain-Boundary Strengthening and Flux Pinning Centers

Journal Article


Abstract


  • It is well known that the existence of interstitial Fe is a great obstacle to enhancing the superconducting properties of the Fe(Se, Te) system. In this work, a silver and oxygen codoping effect toward enhancement of the superconductivity and flux pinning in Fe(Se, Te) bulks is reported. The oxygen ions from SeO2 can induce the precipitation of interstitial Fe as Fe2O3, thus simultaneously optimizing the superconducting properties of Fe(Se, Te) and forming extra flux pinning centers, while the existence of Ag can enhance the intergrain connections of the polycrystalline material by improving the electron transport at grain boundaries. Compared with the undoped sample, the critical current density, the upper critical field, and the thermally activated flux flow activation energy are greatly enhanced by 4.7, 1.7, and 1.5 times, respectively. The novel synthesis technique and optimized properties of this work can pave the way for the development of high-performance Fe(Se, Te) superconducting wires or tapes.

Publication Date


  • 2022

Citation


  • Liu, J., Shao, B., Liu, X., Li, M., Sang, L., Zhang, W., . . . Wang, X. (2022). Improving Superconducting Performance of Fe(Se, Te) with in Situ Formed Grain-Boundary Strengthening and Flux Pinning Centers. ACS Applied Materials and Interfaces, 14(1), 2246-2254. doi:10.1021/acsami.1c18906

Scopus Eid


  • 2-s2.0-85122655402

Start Page


  • 2246

End Page


  • 2254

Volume


  • 14

Issue


  • 1

Abstract


  • It is well known that the existence of interstitial Fe is a great obstacle to enhancing the superconducting properties of the Fe(Se, Te) system. In this work, a silver and oxygen codoping effect toward enhancement of the superconductivity and flux pinning in Fe(Se, Te) bulks is reported. The oxygen ions from SeO2 can induce the precipitation of interstitial Fe as Fe2O3, thus simultaneously optimizing the superconducting properties of Fe(Se, Te) and forming extra flux pinning centers, while the existence of Ag can enhance the intergrain connections of the polycrystalline material by improving the electron transport at grain boundaries. Compared with the undoped sample, the critical current density, the upper critical field, and the thermally activated flux flow activation energy are greatly enhanced by 4.7, 1.7, and 1.5 times, respectively. The novel synthesis technique and optimized properties of this work can pave the way for the development of high-performance Fe(Se, Te) superconducting wires or tapes.

Publication Date


  • 2022

Citation


  • Liu, J., Shao, B., Liu, X., Li, M., Sang, L., Zhang, W., . . . Wang, X. (2022). Improving Superconducting Performance of Fe(Se, Te) with in Situ Formed Grain-Boundary Strengthening and Flux Pinning Centers. ACS Applied Materials and Interfaces, 14(1), 2246-2254. doi:10.1021/acsami.1c18906

Scopus Eid


  • 2-s2.0-85122655402

Start Page


  • 2246

End Page


  • 2254

Volume


  • 14

Issue


  • 1