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Manipulation of octahedral distortion at atomic length scale is an effectivemeans to tune the physical ground states of functional oxides. Previous workdemonstrates that epitaxial strain and film thickness are variable parametersto modify the octahedral rotation and tilt. However, selective control ofbonding geometry by structural propagation from adjacent layers is rarelystudied. Here we propose a new route to tune the ferromagnetic response inSrRuO3 (SRO) ultrathin layers by oxygen coordination of adjacent SrCuO2 (SCO)layers. The infinite-layered CuO2 in SCO exhibits a structural transformationfrom "planar-type" to "chain-type" as reducing film thickness. These twoorientations dramatically modify the polyhedral connectivity at the interface,thus altering the octahedral distortion of SRO. The local structural variationchanges the spin state of Ru and hybridization strength between Ru 4d and O 2porbitals, leading to a significant change in the magnetoresistance andanomalous Hall resistivity of SRO layers. These findings could launch furtherinvestigations into adaptive control of magnetoelectric properties in quantumoxide heterostructures using oxygen coordination.

Dimensional Control of Octahedral Tilt in SrRuO3 via Infinite-layered Oxides