The application of epitaxial strain to perovskite thin films has emerged as a powerful tool for tuning their properties, with differences observed between (001)- and (111)-oriented films. Although these effects have been extensively studied in ${AB\mathrm{O}}_3$ perovskites, the influence of strain on double perovskites remains comparatively underexplored. We present first-principles calculations that investigate the impact of strain on (001)- and (111)-oriented films of the $B$-site ordered double perovskite ${\mathrm{Pb}}_2{\mathrm{CoTeO}}_6$. For both film orientations, we identify a strain-induced transition in the ground state at a small tensile strain, corresponding to a change between phases with distinct octahedral rotation patterns. By analyzing the evolution of bond angles and bond lengths as a function of strain, we correlate these structural changes with the resulting ground-state transitions. Our results demonstrate that epitaxial strain provides an effective route for controlling the ground-state phase of $B$-site ordered double perovskites.

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• Magnetism
• Structural phase transition
• Complex oxides
• Density functional theory