基于自助溶剂法制备高品质的Tl0．4 K0．4 Fe2－y Se2－x Sx体系单晶体样品，详细研究S元素对 Se元素的组分替代作用对 Tl0．4 K0．4 Fe2－y Se2材料超导电性的影响，发现当 S 元素掺杂量大约为 x＝0．8~1．0时， Tl0．4 K0．4 Fe2－y Se2－x Sx体系单晶体样品中可能存在量子临界现象.
Based on self-flux method,the single samples,with high quality,of Tl0.4 K0.4 Fe2-y Se2-x Sx system were prepared successfully.The effects of S-Se substitution on superconductivity in the Tl0.4 K0.4 Fe2-y Se2-x Sx system were studied in detail.When S doping x is from 0.8 to 1.0,there may be quantum critical phenomenon in the single crystal samples of Tl0.4 K0.4 Fe2-y Se2-x Sx .
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