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We measure the resistivity and magnetic susceptibility in the temperaturerange from 5 K to 600 K for the single crystals $A$Fe$_{2-y}$Se$_2$ ($A$ =K$_{0.8}$, Rb$_{0.8}$, Cs$_{0.8}$, Tl$_{0.5}$K$_{0.3}$ andTl$_{0.4}$Rb$_{0.4}$). A sharp superconducting transition is observed in lowtemperature resistivity and susceptibility, and susceptibility shows 100%Meissner volume fraction for all crystals, while an antiferromagnetictransition is observed in susceptibility at Neel temperature ($T_N$) as high as500 K to 540 K depending on A. It indicates the coexistence ofsuperconductivity and antiferromagnetism. A sharp increase in resistivityarises from the structural transition due to Fe vacancy ordering at thetemperature slightly higher than $T_{\rm N}$. Occurrence of superconductivityin an antiferromagnetic ordered state with so high $T_{\rm N}$ may suggest newphysics in this type of unconventional superconductors.

europhysics letters

Coexistence of superconductivity and antiferromagnetism in single  crystals $A_{0.8}Fe_{2-y}Se_2$ (A= K, Rb, Cs, Tl/K and Tl/Rb): evidence from  magnetization and resistivity