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We have synthesized two iron fluo-arsenides $A$Ca$_2$Fe$_4$As$_4$F$_2$ with$A$ = Rb and Cs, analogous to the newly discovered superconductorKCa$_2$Fe$_4$As$_4$F$_2$. The quinary inorganic compounds crystallize in abody-centered tetragonal lattice with space group I4/mmm, which contain doubleFe$_2$As$_2$ layers that are separated by insulating Ca$_2$F$_2$ layers. Ourelectrical and magnetic measurements on the polycrystalline samples demonstratethat the new materials undergo superconducting transitions at Tc = 30.5 K and28.2 K, respectively, without extrinsic doping. The correlations between Tc andstructural parameters are discussed.

Crystal Structure and Superconductivity at about 30 K in $A$Ca$_2$Fe$_4$As$_4$F$_2$ ($A$ = Rb, Cs)