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We have systematically investigated and compared different methods to inducesuperconductivity in iron chalcogenide Fe1+yTe0.6Se0.4 including annealing invacuum, N2, O2, I2 atmosphere, and immersing samples into acid and alcoholicbeverages. Vacuum and N2 annealing are proved to be ineffective to inducesuperconductivity in Fe1+yTe0.6Se0.4 single crystal. O2 and I2 annealing, acidand alcoholic beverages can induce superconductivity by oxidizing the excess Fein the sample. Superconductivity in O2 annealed sample is in bulk nature, whileI2, acid and alcoholic beverages can only induce superconductivity near thesurface. By comparing different effects of O2, I2, acid and alcoholicbeverages, we propose a scenario to explain how the superconductivity isinduced in the non-superconducting as-grown Fe1+yTe0.6Se0.4.

Annealing, acid, and alcoholic beverage effects on Fe1+yTe0.6Se0.4