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$^{75}$As, $^{87}$Rb and $^{85}$Rb nuclear quadrupole resonance (NQR) and$^{87}$Rb nuclear magnetic resonance (NMR) measurements in RbFe$_2$As$_2$iron-based superconductor are presented. We observe a marked broadening of$^{75}$As NQR spectrum below $T_0\simeq 140$ K which is associated with theonset of a charge order in the FeAs planes. Below $T_0$ we observe a power-lawdecrease in $^{75}$As nuclear spin-lattice relaxation rate down to $T^*\simeq20$ K. Below that temperature the nuclei start to probe different dynamicsowing to the different local electronic configurations induced by the chargeorder. A fraction of the nuclei probes spin dynamics associated with electronsapproaching a localization while another fraction probes activated dynamicspossibly associated with a pseudogap. These different trends are discussed inthe light of an orbital selective behaviour expected for the electroniccorrelations.

Superconductivity emerging from an electronic phase separation in the charge ordered phase of RbFe$_2$As$_2$