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We report muon spin rotation experiments on the magnetic penetration depthlambda and the temperature dependence of lambda^{-2} in the over-doped Fe-basedhigh-temperature superconductor (Fe-HTS) Ba_{1-x}Rb_ xFe_2As_2 (x = 0.65)studied at ambient and under hydrostatic pressures up to p = 2.3 GPa. We findthat in this system lambda^{-2}(T) is best described by d-wave scenario. Thisis in contrast to the case of the optimally doped x = 0.35 system which isknown to be a nodeless s^{+-}-wave superconductor. This suggests that thedoping induces the change of the pairing symmetry from s^{+-} to d-wave inBa_{1-x}Rb_{x}Fe_{2}As_{2}. In addition, we find that the d-wave orderparameter is robust against pressure, suggesting that d is the common anddominant pairing symmetry in over-doped Ba_{1-x}Rb_{x}Fe_{2}As_{2}. Applicationof pressure of p = 2.3 GPa causes a decrease of lambda(0) by less than 5 %,while at optimal doping x = 0.35 a significant decrease of lambda(0) wasreported. The superconducting transition temperature T_c as well as the gap toT_c ratio 2Delta/k_BT_c show only a modest decrease with pressure. By combiningthe present data with those previously obtained for optimally doped system x =0.35 and for the end member x = 1 we conclude that the SC gap symmetry as wellas the pressure effects on the SC quantities strongly depend on the Rb dopinglevel. These results are discussed in the light of the putative Lifshitztransition, i.e., a disappearance of the electron pockets in the Fermi surfaceof Ba_{1-x}Rb_{x}Fe_{2}As_{2} upon hole doping.

Probing the pairing symmetry in the over-doped Fe-based superconductor Ba_0.35Rb_0.65Fe_2As_2 as a function of hydrostatic pressure