Higher angular momentum pairing states in Sr${}_2$RuO${}_4$ in the presence of longer-range interactions

The superconducting symmetry of Sr${}_2$RuO${}_4$ remains a puzzle. Time-reversal symmetry breaking $d_{x^2-y^2}+i{g}_{xy(x^2-y^2)}$ pairing has been proposed for reconciling multiple key experiments. However, its stability remains unclear. In this work, we theoretically study the superconducting instabilities in Sr${}_2$RuO${}_4$, including the effects of spin-orbit coupling (SOC), in the presence of both local and longer-range interactions within a random phase approximation. We show that the inclusion of second nearest neighbor repulsions, together with non-local SOC in the $B_{2g}$ channel or orbital-anisotropy of the non-local interactions, can have a significant impact on the stability of both $d_{x^2-y^2}$- and $g$-wave pairing channels. We analyze the properties, such as Knight shift and spontaneous edge current, of the realized $d_{x^2-y^2}+ig$, $s^{\mathrm{\prime }}+i{d}_{xy}$ and mixed helical pairings in different parameter spaces and find that the $d_{x^2-y^2}+ig$ solution is in better agreement with the experimental data.