Oxygen scavenging at oxide heterointerfaces has emerged as a powerful route for stabilizing metastable phases that exhibit interesting phenomena, including high-mobility, two-dimensional electron gases and high-${\mathrm{T}}_c$ superconductivity. We investigate structural and chemical interactions at the heterointerface formed between Al or Eu and the charged-ordered insulator, ${\mathrm{BaBiO}}_3$, leading to emergent superconductivity at 6 K. A combination of x-ray diffraction and electron microscopy measurements shows that oxygen scavenging by the Eu and Al adlayers leads to the formation of superconducting intermetallic ${\mathrm{BaBi}}_3$ in nominal $\mathrm{Eu}\text{/}{\mathrm{BaBiO}}_3$ and $\mathrm{Al}\text{/}{\mathrm{BaBiO}}_3$ bilayers. Anisotropic magnetotransport measurements and current-voltage signatures of quasi-two-dimensional superconductivity are observed. The mechanisms behind quasi-two-dimensional superconductivity and the role of disorder remain to be clarified. These findings highlight the potential for the use of in situ reduction of bismuthate heterostructures as a platform for stabilizing materials with exotic functional properties. Additionally, the strong spin-orbit coupling at the Bi sites may pave the way for the realization of high-${\mathrm{T}}_c$ topological superconductivity.

Close

PrevNext

View figure in article

• Electrical properties
• Superconductivity
• Resistivity measurements
• X-ray diffraction