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Measurements of the magnetic penetration depth (lambda) in the Fe-basedsuperconductor Ba_(1-x)Rb_xFe_2As_2 (x=0.3, 0.35, 0.4) were carried out usingthe muon-spin rotation muSR technique. The temperature dependence of lambda iswell described by a two-gap s+s-wave scenario with a small gap Delta_1 = 1 - 3mev and a large gap Delta_2 = 7 - 9 mev. By combining the present data withthose obtained for RbFe_2As_2 a decrease of the BCS ratio 2Delta_2/(k_B)(T_c)with increasing Rb content x is observed. On the other hand, the BCS ratio2Delta_1/(k_B)(T_c) is almost independent of x. In addition, the contributionof Delta_1 to the superfluid density is found to increase with x. These resultsare discussed in the light of the suppression of interband processes upon holedoping.

Muon-spin rotation measurements of the magnetic penetration depth in the Fe-based superconductor Ba_(1-x)Rb_(x)Fe2As2