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The structural, electronic, lattice dynamics, electron-phonon coupling, andsuperconducting properties of the alkali-metal hydride RbH, metalized throughelectron-doping by the construction of the solid-solution Rb$_{1-x}$Sr$_x$H,are systematically analyzed as a function of Sr-content within the framework ofdensity functional perturbation and Migdal-Eliashberg theories, taking intoaccount the effect of zero-point energy contribution by the quasi-harmonicapproximation. For the entire studied range of Sr-content, steady increments ofthe electron-phonon coupling constant and the superconducting criticaltemperature are found with progressive alkaline-earth metal content throughelectron-doping, reaching the values of $\lambda=1.92$ and $T_c=51.3(66.1)$~Kwith $\mu^*$=0.1(0). The steady rise of such quantities as a function ofSr-content is consequence of the metallization of the hydride as an increase ofdensity of states at the Fermi level is observed, as well as the softening ofthe phonon spectrum, mainly coming from H-optical modes. Our results indicatethat electron-doping on metal-hydrides is an encouraging alternative to lookfor superconductivity without applied pressure.

A first-principles study of superconductivity on RbH by doping without applied pressure