Peculiar magnetotransport properties in epitaxially stabilized orthorhombic Ru3+ perovskite LaRuO3 and NdRuO3

Complex oxides are interesting materials where multiple physical properties and functionalities can be realized by integrating different elements in a single compound. However, owing to the chemical instability, not all the combinations of elements can be materialized despite the intriguing potential expected from their magnetic and electronic properties. Here we demonstrate an epitaxial stabilization of orthorhombic Ru 3+ perovskite oxides: LaRuO 3 and NdRuO 3 , and their magnetotransport properties that reflect the difference between non-magnetic La 3+ and magnetic Nd 3+ . Above all, an unconventional anomalous Hall effect accompanied by an inflection point in magnetoresistance is observed around 1.3 T below 1 K for NdRuO 3 , which we propose is possibly related to a non-coplanar spin texture on Nd 3+ sublattice. These studies not only serve as a new testbed for the interplay between spin-orbit coupling and Coulomb interaction but also open a new avenue to explore topological emergent phenomena in well-studied perovskite oxides. Complex oxides are interesting for their potential to host multiple properties and functionalities by integrating different elements in a single compound, however they are often challenging to stabilize. Here, epitaxial stabilization of LaRuO 3 and NdRuO 3 is demonstrated, revealing an unconventional anomalous Hall effect in NdRuO 3 which is possibly related to a non-coplanar spin texture on the Nd 3+ sublattice.