Digital superlattices of (LaMn O3) m (SrMn O3) 2m (m≤3) having the same nominal composition as La13 Sr23 Mn O3, an antiferromagnetic insulator, have been synthesized by means of molecular beam epitaxy. All superlattices show a sharp resistive maximum at temperatures near to or higher than the Ńel temperature of bulk La13 Sr23 Mn O3. No discernible signatures of magnetic ordering are observed near the resistivity peak for m≤2, but m=3 has a susceptibility peak consistent with antiferromagnet ordering, which is canted when cooled in a small magnetic field. Analogies are drawn to d x2 - y2 orbitally ordered, layered antiferromagnetic manganites to explain the observations.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)