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A double-layered perovskite oxide Sr$_3$Mo$_2$O$_7$ is considered a "hiddenladder" system with wide and narrow bands near the Fermi level, for whichhigh-$T_{\rm c}$ superconductivity is expected. However, the difficulty insynthesis, especially in the preparation of samples without oxygen deficiency,can hinder the observation of superconductivity. In this study, we constructeda double-layer SrMoO$_3$ block through artificial superlattices with theinsulating SrTiO$_3$ block, (SrMoO$_3$)$_m$/(SrTiO$_3$)$_t$ ($m = 2, 4$; $t =4$). First-principles calculations for bilayered SrMoO$_3$ ($m = 2$) exhibit awide-narrow band structure near the Fermi level, which bears a closeresemblance to Sr$_3$Mo$_2$O$_7$. The dispersion along the $k_z$ direction isstrongly suppressed by increasing the number of the SrTiO$_3$ layers, $t$.However, no superconductivity is observed down to 0.1 K. We discuss the absenceof the superconductivity for the present films on the basis of results ofscanning transmission electron microscopy and band structure calculations.

Hidden Ladder in SrMoO$_3$/SrTiO$_3$ Superlattices: Experiments and Theoretical Calculations