Spinodal decomposition, the spontaneous phase separation process of periodic lamellae at the nanometer scale, of correlated oxide ((Ti, V)O₂) systems offers a sophisticated route to achieve a new class of mesoscale structures in the form of self-assembled superlattices for possible applications using steep metal–insulator transitions. Here, we achieve the tunable self-assembly of (Ti, V)O₂ superlattices with steep transitions (ΔT_MI < 5 K) by spinodal decomposition with accurate control of the growth parameters without conventional layer-by-layer growth. Abrupt compositional modulation with alternating Ti-rich and V-rich layers spontaneously occurs along the growth direction because in-plane lattice mismatch is smaller in this direction than in other directions. An increase in the film growth rate thickens periodic alternating lamellae; the phase separation can be kinetically enhanced by adatom impingement during two-dimensional growth, demonstrating that the interplay between mass transport and uphill diffusion yields highly periodic (Ti, V)O₂ superlattices with tunable lamellar periods. Our results for creating correlated (Ti, V)O₂ oxide superlattices provide a new bottom-up strategy to design rutile oxide tunable nanostructures and present opportunities to design new material platforms for electronic and photonic applications with correlated oxide systems.

旋节线分解，相关的氧化物（（Ti，V）O ₂）系统在纳米尺度上周期性的层状膜的自发相分离过程，提供了一条复杂的途径以自组装超晶格的形式实现新型中尺度结构。使用陡峭的金属-绝缘体过渡的可能应用。在这里，我们实现了具有陡峭跃迁（ΔT _MI的（Ti，V）O ₂超晶格的可调谐自组装 通过旋节线分解（<5 K）精确控制生长参数，而无需常规的逐层生长。由于在该方向上的面内晶格失配比在其他方向上小，所以沿生长方向自发地发生具有交替的富Ti和富V层交替的突然成分调制。膜生长速率的增加会使周期性交替的薄片变厚；在二维生长过程中，通过吸附原子可以使相分离在动力学上得到增强，这表明物质传输和上坡扩散之间的相互作用产生了具有可调层状周期的高度周期性（Ti，V）O ₂超晶格。我们创建相关（Ti，V）O _2的结果 氧化物超晶格提供了一种新的自下而上的策略来设计金红石氧化物可调谐纳米结构，并提供了利用相关的氧化物系统设计用于电子和光子应用的新材料平台的机会。