The isotropic, nonmagnetic doped $\mathrm{BaBi}{\mathrm{O}}_3$ superconductors maintain some similarities to high-$T_{\mathrm{c}}$ cuprates, while also providing a cleaner system for isolating charge density wave (CDW) physics that commonly competes with superconductivity. Artificial layered superlattices offer the possibility of engineering the interaction between superconductivity and CDW. Here we stabilize a low-temperature, fluctuating short-range CDW order by using artificially layered epitaxial ${\left(\mathrm{BaPb}{\mathrm{O}}_3\right)}_{3m}/{\left(\mathrm{BaBi}{\mathrm{O}}_3\right)}_m$ ($m=1–10$ unit cells) superlattices that are not present in the optimally doped $\mathrm{BaP}{\mathrm{b}}_{0.75}\mathrm{B}{\mathrm{i}}_{0.25}{\mathrm{O}}_3$ alloy with the same overall chemical formula. Charge transfer from $\mathrm{BaBi}{\mathrm{O}}_3$ to $\mathrm{BaPb}{\mathrm{O}}_3$ effectively dopes the former and suppresses the long-range CDW; however, as the short-range CDW fluctuations strengthen at low temperatures charge appears to localize and superconductivity is weakened. The monolayer structural control demonstrated here provides compelling implications to access controllable, local density wave orders absent in bulk alloys and manipulate phase competition in unconventional superconductors.

• Received 23 September 2018
• Revised 27 December 2019
• Accepted 23 January 2020

DOI:https://doi.org/10.1103/PhysRevB.101.064509