Abstract When transition metal oxides is grown along (111) direction, a variety of intriguing phenomena is expected to arise. One of important system, SrIrO3, crystallizes into monoclinic hexagonal-based 6M structure when grown on (111)-oriented perovskite SrTiO3, and is expected to host novel topological states. However, the growth of high quality SrIrO3 on (111)-oriented substrate is still a challenge. We report on high-quality layer-by-layer epitaxial growth of monoclinic SrIrO3 on SrTiO3(111) substrate by inserting the CaTiO3 buffer layer. The scanning transmission electron microscopy image shows perfect epitaxial growth of monoclinic SrIrO3. Reflection high-energy electron diffraction and low-energy electron diffraction patterns exhibit smooth film surface with reconstruction. Inserting CaTiO3 buffer layer proves to be an effective way of interface engineering in realizing layer-by-layer growth by reducing the lattice mismatch. The study paves way for the future research on novel quantum states in monoclinic SrIrO3 films and heterostructures.

中文翻译：

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通过界面工程在(111)取向的SrTiO3上逐层外延生长单斜SrIrO3薄膜

摘要 当过渡金属氧化物沿（111）方向生长时，预计会出现各种有趣的现象。重要的系统之一，SrIrO3，在 (111) 取向的钙钛矿 SrTiO3 上生长时结晶成单斜六方基 6M 结构，并有望拥有新的拓扑状态。然而，在（111）取向的衬底上生长高质量的 SrIrO3 仍然是一个挑战。我们报告了通过插入 CaTiO3 缓冲层在 SrTiO3(111) 衬底上高质量逐层外延生长单斜晶系 SrIrO3。扫描透射电子显微镜图像显示了单斜晶 SrIrO3 的完美外延生长。反射高能电子衍射和低能电子衍射图案显示出具有重建的光滑薄膜表面。插入CaTiO3缓冲层被证明是通过减少晶格失配来实现逐层生长的界面工程的有效方法。该研究为未来研究单斜 SrIrO3 薄膜和异质结构中的新型量子态铺平了道路。