Superconductivity at T_{c}∼14 K in single-crystalline FeTe_{0.61}Se_{0.39}

By T. Taen, Yoshishige Tsuchiya, Y. Nakajima, T. Tamegai. 2009

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Single-crystalline ${\text{FeTe}}_{0.61}{\text{Se}}_{0.39}$ with a sharp superconducting transition at ${T}_{c}\ensuremath{\sim}14\text{ }\text{K}$ is synthesized via slow furnace cooling followed by low-temperature annealing. The effect of annealing on the chemical and superconducting inhomogeneities is carefully characterized. We also report resistivity, magnetization, and magneto-optical images of this crystal. Based on the Bean model, critical current density is estimated to exceed $1\ifmmode\times\else\texttimes\fi{}{10}^{5}\text{ }\text{A}/{\text{cm}}^{2}$ below 5 K under zero field. Weak fish-tail effect is identified at lower temperatures.

Subfields: Accounting, Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/41415d03b8aa7c69cdcae8c1db839f412ad90f44