The electrical, magnetic, and structural properties of Sr3(Ru1-xMnx) 2O7(0≤x≤0.2) are investigated. The parent compound Sr3Ru2O7 is a paramagnetic metal, critically close to magnetic order. We have found that, with a Ru-site doping by only a few percent of Mn, the ground state is switched from a paramagnetic metal to an antiferromagnetic insulator. Optical conductivity measurements show the opening of a gap as large as 0.1 eV, indicating that the metal-to-insulator transition is driven by the electron correlation. The complex low-temperature antiferromagnetic spin arrangement, reminiscent of those observed in some nickelates and manganites, suggests a long-range orbital order.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2005 Sept 1|