Effects of Annealing under Tellurium Vapor for Fe${}_{1.03}$Te${}_{0.8}$Se${}_{0.2}$ Single Crystals

Abstract

In this study, the effects of annealing under tellurium vapor have been investigated for Fe${}_{1.03}$Te${}_{0.8}$Se${}_{0.2}$ single crystals. The as-grown crystal is not superconducting. After annealing it at 400 ${}^{\circ }$C for 250 h in tellurium (Te) vapor, it shows metallic resistivity temperature dependence below 150 K and a sharp superconducting transition at 13 K. The sample also shows a full magnetic shielding effect at low temperatures. The improvement in superconductivity has been attributed to the removal of excess Fe, which is inevitably incorporated in the as-grown crystals, by the annealing.

9 pages, 6 figures

References in corpus (4)

• Superconductivity close to magnetic instability in Fe(Se1-xTex)0.82
• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x
• Evidence for dominant Pauli paramagnetic effect in the upper critical fields of a FeTe0.6Se0.4 superconductor

Cited by in corpus (5)

• Incoherent-coherent crossover and the pseudogap in Te-annealed superconducting Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ revealed by magnetotransport measurements
• On the role of chalcogen vapor annealing in inducing bulk superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Superconductivity in FeTe0.8S0.2 induced by battery-like reaction
• Effects of Iodine Annealing on Fe1+yTe0.6Se0.4
• Superconducting Gap and Symmetry in FeSe_1-x_Te_x_ Studied by Specific Heat in Magnetic Fields