Clarification as to why alcoholic beverages have the ability to induce   superconductivity in Fe_{1+d}Te_{1-x}S_x
  To elucidate the mechanism as to why alcoholic beverages can induce superconductivity in Fe_{1+d}Te_{1-x}S_x samples, we performed component analysis and found that weak acid such as organic acid has the ability to induce superconductivity. Inductively-coupled plasma spectroscopy was performed on weak acid solutions post annealing. We found that the mechanism of inducement of superconductivity in Fe_{1+d}Te_{1-x}S_x is the deintercalation of excess Fe from the interlayer sites. 
K. Deguchi, D. Sato, M. Sugimoto, H. Hara, Y. Kawasaki, S. Demura, T.   Watanabe, S. J. Denholme, H. Okazaki, T. Ozaki, T. Y...
cond-mat.supr-con