Evolution of Superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ Annealed in Te Vapor

Abstract

We report a detailed study of the Te vapor annealing effect in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ single crystals. Bulk superconductivity can be gradually induced by annealing with increasing amount of Te, until the molar ratio of Te to the sample reaches 1 : 10. By further increasing Te molar ratio, superconducting volume is gradually reduced. Resistivity and Hall effect measurements manifest that annealing in Te vapor delocalizes the charge carriers by removing excess Fe. The optimally Te annealed crystal shows homogeneous critical current densities with a large value of $\sim$ 4.3 $\times$ 10${}^5$ A/cm${}^2$, which proves that the Te annealing is effective to induce bulk superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$.

4 pages, 6 figures

References in corpus (10)

• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Phase Diagram and High Temperature Superconductivity at 65 K in Tuning Carrier Concentration of Single-Layer FeSe Films
• Extreme Sensitivity of Superconductivity to Stoichiometry in FeSe (Fe1+dSe)
• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x
• Enhancement of superconducting transition temperature of FeSe by intercalation of a molecular spacer layer
• Density Functional Study of Excess Fe in Fe${}_{1+x}$Te: Magnetism and Doping
• Annealing, acid, and alcoholic beverage effects on Fe1+yTe0.6Se0.4
• Large, Homogeneous, and Isotropic Critical Current Density in Oxygen-Annealed Fe1+yTe0.6Se0.4 Single Crystal
• Effects of Annealing under Tellurium Vapor for Fe${}_{1.03}$Te${}_{0.8}$Se${}_{0.2}$ Single Crystals

Cited by in corpus (15)

• Dynamics and mechanism of oxygen annealing in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ single crystal
• Review of annealing effects and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ superconductors
• Multiband Effect and Possible Dirac Fermions in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$
• Bulk Superconductivity in Fe1+yTe0.6Se0.4 Induced by Removal of Excess Fe
• Bulk Superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ Induced by Annealing in Se and S Vapor
• Coexistence of two superconducting phases in Ca1-xLaxFe2As2
• Evolution of superconducting and transport properties in annealed FeTe${}_{1-x}$Se${}_x$ (0.1 $\le$ $x$ $\le$ 0.4) multiband superconductors
• Comparative study of superconducting and normal-state anisotropy in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ superconductors with controlled amounts of interstitial excess Fe
• On the role of chalcogen vapor annealing in inducing bulk superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Deviation from canonical collective creep behavior in Li${}_{0.8}$Fe${}_{0.2}$OHFeSe
• Sulfur annealing effect for superconductivity in iron chalcogenide compounds
• Bulk and surface Dirac states accompanied by two superconducting domes in FeSe-based superconductors
• Effects of Iodine Annealing on Fe1+yTe0.6Se0.4
• Magneto-optical characterizations of FeTe${}_{0.5}$Se${}_{0.5}$ thin films with critical current density over 1 MA/cm${}^2$
• Evolution of the intertwining correlated topological phases in iron-based superconductor Fe(Te,Se)