Cometal addition effect on superconducting properties and granular behaviours of polycrystalline FeSe0.5Te0.5

Abstract

The enhanced performance of superconducting FeSe0.5Te0.5 materials with added microsized Pb and Sn particles is presented. A series of Pb and Sn added FeSe0.5Te0.5 (FeSe0.5Te0.5 + xPb + ySn; x = y = 0-0.1) bulks are fabricated by solid-state reaction method and characterized through various measurements. A very small amount of Sn and Pb additions enhance the transition temperature (Tconset) of pure FeSe0.5Te0.5 by 1 K, sharpening the superconducting transition and improving the metallic nature in the normal state, whereas larger metal additions reduce Tconset by broadening the superconducting transition. Microstructural analysis and transport studies suggest that at x=y>0.02, Pb and Sn additions enhance the impurity phases, reduce the coupling between grains, and suppress the superconducting percolation, leading to a broad transition. FeSe0.5Te0.5 samples with 2wt% of cometal additions show the best performance with their critical current density, Jc, and the pinning force, Fp, which might be attributable to providing effective flux pinning centres. Our study shows that the inclusion of a relatively small amount of Pb and Sn works effectively for the enhancement of superconducting properties with an improvement of intergrain connections as well as better phase uniformity.

References in corpus (16)

• Tellurium substitution effect on superconductivity of the alpha-phase Iron Selenide
• Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x
• Fe-based high temperature superconductivity with Tc=31K bordering an insulating antiferromagnet in (Tl,K)FexSe2 Crystals
• Structure determination and coexistence of superconductivity and antiferromagnetic order in (Li0.8Fe0.2)OHFeSe
• Substitution Effects on FeSe Superconductor
• A review of Fe-chalcogenide superconductors: the simplest Fe-based superconductor
• Eigenfunction fractality and pseudogap state near superconductor-insulator transition
• Exotic Superconducting States in FeSe-based Materials
• Physical properties of FeSe${}_{0.5}$Te${}_{0.5}$ single crystals grown under different conditions
• Metal - Insulator transition in Fe1.01-xCuxSe
• High critical current density and improved flux pinning in bulk MgB2 synthesized by Ag addition
• Combined microstructural and magneto optical study of current flow in polycrystalline forms of Nd and Sm Fe-oxypnictides
• Enhanced superconducting properties in FeCr${}_x$Se
• Effect of 3d Metal (Co and Ni) Doping on the Superconductivity of FeSe0.5Te0.5
• The drastic effect of the impurity scattering on the electronic and superconducting properties of Cu-doped FeSe
• Effect of Pb addition on microstructure, transport properties and the critical current density in a polycrystalline FeSe0.5Te0.5

Cited by in corpus (3)

• High-pressure synthesis and the enhancement of the superconducting properties of FeSe0.5Te0.5
• High gas pressure and high-temperature synthesis (HP-HTS) technique and its impact on iron-based superconductors
• Comparison of Gd addition effect on the superconducting properties of FeSe0.5Te0.5 bulks under ambient and high-pressure conditions