Emergent antiferromagnetism of YTiO3 in YTiO3-CaTiO3 superlattices

Transport and magnetoresistance measurements are performed on metallic, high-carrier density YTiO3-CaTiO3 superlattices acting as a unique probe of an emergent magnetic order in YTiO3. On varying the thickness of YTiO3 while keeping the CaTiO3 layer thickness constant, a non-Fermi-liquid charge transport and positive magnetoresistance are observed. Analyses of the origin of such effects reveal that an unusual antiferromagnetic order is realized in the ultrathin, epitaxially strained YTiO3 layers, which is in excellent agreement with recent theoretical predictions.