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• W4220813447 endingPage "103433" @default.
• W4220813447 startingPage "103433" @default.
• W4220813447 abstract "FeSe1−xTex superconductor has excellent physical and chemical properties. However, anisotropy of the critical current density (Jc) and lack of strong flux pinning still hinders it from practical applications. In this article, Fe1−ySnySe0.4Te0.6 crystals were grown to study Sn doping effect on the improvement of the superconducting performance. Compared with the undoped, the Jc and the irreversible field Hirr are significantly enhanced for Sn-doped crystals with y = 0.08. In the temperature range of 4.2–8 K and the magnetic field up to 7 T, the Jc is increased by 4 times, at the meantime, the Jc anisotropy parameter, γ = JcH||c/JcH⊥c is reduced significantly. Structure and microstructure analysis shows that doping Sn in FeSe0.4Te0.6 reduces the crystal anisotropy and introduces secondary phase nanoparticles, which can be regarded as the main reason for the reduction of the Jc anisotropy and the significant enhancement the magnetic flux pinning force of FeSe0.4Te0.6 superconductors. Due to the existence of intrinsic pinning or the new pinning mechanism introduced by nanoparticles, the pinning behavior of the FeSe0.4Te0.6 in H⊥c or in the higher doping level sample (y = 0.08) significantly deviates from the δℓ-type point pinning behavior which was often observed in the in-plane pinning for undoped FeSe0.4Te0.6 crystals." @default.
• W4220813447 created "2022-04-03" @default.
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• W4220813447 date "2022-06-01" @default.
• W4220813447 modified "2023-10-12" @default.
• W4220813447 title "Significant enhancement in Jc and suppression of Jc anisotropy for Sn-doped FeSe0.4Te0.6 single crystals" @default.
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• W4220813447 doi "https://doi.org/10.1016/j.mtcomm.2022.103433" @default.
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