Epitaxial BiFeO₃/SrRuO₃ superlattices have been grown by pulsed laser deposition on a (001) oriented LaAlO₃ substrate and probed by X-ray diffraction and Raman spectroscopy. To investigate the structural competition between rhombohedral BiFeO₃ and orthorhombic SrRuO₃ the total thickness of all SLs was kept constant and the bilayer thickness (period) Λ was varied. The interlayer strain effects are therefore tuned from large strain effects (short Λ period) to quasi-relaxed structure (large Λ). A complementary investigation using X-ray diffraction and phonon dynamics hints to change from a rhombohedral to a tetragonal structure in the superlattices with the increase of the interlayer strain effect.

外延BiFeO ₃ /SrRuO ₃超晶格已通过脉冲激光沉积在 (001) 取向的 LaAlO ₃衬底上生长，并通过 X 射线衍射和拉曼光谱探测。为了研究菱形BiFeO ₃和斜方晶 SrRuO ₃之间的结构竞争，所有 SL 的总厚度保持恒定，双层厚度（周期）Λ 变化。因此，层间应变效应从大应变效应（短 Λ 周期）调整为准松弛结构（大 Λ）。使用 X 射线衍射和声子动力学的补充研究表明，随着层间应变效应的增加，超晶格中从菱面体结构变为四方体结构。