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We report on the superconducting properties of A_{x}Fe_{2-y}Se_{2} (A = Rb,K) single crystals studied with the muon spin relaxation or rotation (\muSR)technique. At low temperatures, close to 90% of the sample volumes exhibitlarge-moment magnetic order which impedes the investigation of theirsuperconducting properties by \muSR. On the other hand, about 10% of the samplevolumes remain paramagnetic and clearly show a superconducting response. Thetemperature dependence of the superconducting carrier density was analyzedwithin the framework of a single s-wave gap scenario. The zero-temperaturevalues of the in-plane magnetic penetration depths \lambda_{ab}(0) = 258(2) and225(2) nm and the superconducting gaps \Delta(0) = 7.7(2) and 6.3(2) meV havebeen determined for A = Rb and K, respectively. The microscopic coexistenceand/or phase separation of superconductivity and magnetism is discussed.

Superconducting properties of single-crystalline A_{x}Fe_{2-y}Se_{2} (A=Rb, K) studied using muon spin spectroscopy