Rotational properties in even-even superheavy ${}^{254-258}$Rf nuclei based on total-Routhian-surface calculations

High-spin yrast structures of even-even superheavy nuclei ${}^{254-258}$Rf are investigated by means of total-Routhian-surface approach in three-dimensional (${\beta }_2,\gamma ,{\beta }_4$) space. The behavior in the moments of inertia of ${}^{256}$Rf is well reproduced by our calculations, which is attributed to the $j_{15\mathrm{/}2}$ neutron rotation-alignment. The competition between rotationally aligned $i_{13\mathrm{/}2}$ proton and $j_{15\mathrm{/}2}$ neutron is discussed. High-spin predictions are also made for its neighboring isotopes ${}^{254,258}$Rf.