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Frustrated magnets are one class of fascinating materials that host manyintriguing phases such as spin ice, spin liquid and complex long-range magneticorderings at low temperatures. In this work we use first-principlescalculations to find that in a wide range of magnetically frustrated oxides, atzero temperature a number of non-collinear magnetic orderings are more stablethan the type-I collinear ordering that is observed at finite temperatures. Theemergence of non-collinear orderings in those complex oxides is due tohigher-order exchange interactions that originate from second-row and third-rowtransition metal elements. This implies a collinear-to-noncollinear spintransition at sufficiently low temperatures in those frustrated complex oxides.Furthermore, we find that in a particular oxide Ba$_2$YOsO$_6$, experimentallyfeasible uniaxial strain can tune the material between two differentnon-collinear magnetic orderings. Our work predicts new non-collinear magneticorderings in frustrated complex oxides at very low temperatures and provides amechanical route to tuning complex non-collinear magnetic orderings in thosematerials.

journal of physics. condensed matter

The complex non-collinear magnetic orderings in Ba2YOsO6: A new approach  to tuning spin-lattice interactions and controlling magnetic orderings in  frustrated complex oxides