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Complex oxides are mesmerizing material systems to realize multiple physicalproperties and functionalities by integrating different elements in a singlecompound. However, owing to the chemical instability, not all the combinationsof elements can be materialized despite the intriguing potential expected fromtheir magnetic and electronic properties. In this study, we demonstrate anepitaxial stabilization of orthorhombic Ru$^{3+}$ perovskite oxides: LaRuO$_3$and NdRuO$_3$, and their magnetotransport properties that reflect thedifference between non-magnetic La$^{3+}$ and magnetic Nd$^{3+}$. Above all, anunconventional anomalous Hall effect accompanied by an inflection point inmagnetoresistance is observed around 1.3 T below 1 K for NdRuO$_3$, which isascribed to topological Hall effect possibly due to a non-coplanar spin textureon Nd$^{3+}$ sublattice. These studies not only serve a new testbed for theinterplay between spin-orbit coupling and Coulomb interaction but also open anew avenue to explore topological emergent phenomena in well-studied perovskiteoxides.

Unconventional anomalous Hall effect in epitaxially stabilized orthorhombic Ru$^{3+}$ perovskite thin films