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A study of the temperature and field dependence of the penetration depth\lambda of the superconductor RbFe_2As_2 (T_c=2.52 K) was carried out by meansof muon-spin rotation measurements. In addition to the zero temperature valueof the penetration depth \lambda(0)=267(5) nm, a determination of the uppercritical field B_c2(0)=2.6(2) T was obtained. The temperature dependence of thesuperconducting carrier concentration is discussed within the framework of amulti-gap scenario. Compared to the other "122" systems which exhibit muchhigher Fermi level, a strong reduction of the large gap BCS ratio 2\Delta/k_BT_c is observed. This is interpreted as a consequence of the absence ofinterband processes. Indications of possible pair-breaking effect are alsodiscussed.

Microscopic Study of the Superconducting State of the Iron Pnictide RbFe_2As_2