Emergent properties of digital superlattices of LaMnO$_{3}$/SrMnO$_{3}$

LaMnO$_{3}$ and SrMnO$_{3}$, both antiferromagnetic insulators, are end members of the La$_{1-x}$Sr$_{x}$MnO$_{3}$ phase diagram, which includes a highly spin-polarized ferromagnetic metal and a variety of orbital-ordered antiferromagnets. Interfaces between LaMnO$_{3}$ and SrMnO$_{3}$ provide a unique environment where the spin, charge and orbital degrees of freedom of each of the constituents may `reconstruct', giving rise to collective states at interfaces that are qualitatively distinct from those in either LaMnO$_{3}$ or SrMnO$_{3}$. We have synthesized superlattices of (LaMnO$_{3})_{p}$/(SrMnO$_{3})_{q}$ , where $x=q/(p+q),$ using ozone-assisted molecular beam epitaxy. Here, $p $ and $q $represent integer layers of the constituents. These superlattices can be realized with interfacial roughness/intermixing limited to a region less than one unit-cell in extent. We will explore the properties of these `digital manganites' for a range of $p/q$, including enhanced ordering temperatures compared to randomly alloyed samples, and provide experimental evidence for the interfacial reconstruction that is responsible for their emergent properties.