Abstract
We have systematically investigated the evolution of the magnetic structure of the bilayer ruthenate induced upon Mn doping. For , the materials exhibit the same spin structure as that of the parent compound at low temperature, while an incommensurate cycloidal magnetic structure emerges at slightly above the metal-insulator transition (MIT) temperature . In contrast, for the ground state becomes a G-type antiferromagnetic Mott insulator. Furthermore, we have observed magnetic-field-induced transitions in , which is positioned at the phase boundary. Below , the magnetic transition is accompanied by a structural transition, as well as a dramatic change in the electronic properties from a Mott insulator to a localized phase. On the contrary, an incommensurate-to-commensurate spin structure transition is observed for . Our results suggest strong competing magnetic tendencies in this bilayer ruthenate system that are very susceptible to transition-metal substitution and magnetic field.
1 More- Received 13 January 2017
DOI:https://doi.org/10.1103/PhysRevB.95.144426
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