Effects of Iodine Annealing on Fe1+yTe0.6Se0.4

Abstract

Effects of iodine annealing to induce bulk superconductivity in Fe1+yTe0.6Se0.4 have been systematically studied by changing the molar ratio of iodine to the sample and annealing temperature. The optimal condition to induce bulk superconductivity with Tc ~14.5 K and self-field Jc(2 K) ~ 5x10^5 A/cm2 is found to be a molar ratio of iodine of 5-7 % at the annealing temperature of 400 C. Furthermore, the fact that no compounds containing iodine are detected in the crystal and a significant amount of FeTe2 is produced after the iodine annealing strongly indicate that the excess iron is consumed to form FeTe2 and iodine works as a catalyst in this process.

arXiv comment14 pages, 7 figures

References in corpus (18)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• The superconductivity at 18 K in LiFeAs system
• Extreme Sensitivity of Superconductivity to Stoichiometry in FeSe (Fe1+dSe)
• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• Charge carrier localization induced by excess Fe in the Fe1+y(Te,Se) superconductor system
• Superconductivity at T_c ~ 14 K in Single Crystalline FeTe${}_{0.61}$Se${}_{0.39}$
• Upper critical field, lower critical field and critical current density of FeTe0.60Se0.40 single crystal
• Physical properties of FeSe${}_{0.5}$Te${}_{0.5}$ single crystals grown under different conditions
• Tuning the superconducting and magnetic properties in Fe_ySe_0.25Te_0.75 by varying the Fe-content
• Dynamics and mechanism of oxygen annealing in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ single crystal
• Temperature and time scaling of the peak-effect vortex configuration in FeTe${}_{0.7}$Se${}_{0.3}$
• Annealing, acid, and alcoholic beverage effects on Fe1+yTe0.6Se0.4
• The flux pinning force and vortex phase diagram of single crystal FeTe0.60Se0.40
• 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
• Evolution of Superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ Annealed in Te Vapor
• 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

Cited by in corpus (1)

• Review of annealing effects and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ superconductors