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The electrical, magnetic, and structural properties ofSr$_3$(Ru$_{1-x}$Mn$_x$)$_2$O$_7$ (0 $\leq x \leq$ 0.2) are investigated. Theparent compound Sr$_3$Ru$_2$O$_7$ is a paramagnetic metal, critically close tomagnetic order. We have found that, with a Ru-site doping by only a few percentof Mn, the ground state is switched from a paramagnetic metal to anantiferromagnetic insulator. Optical conductivity measurements show the openingof a gap as large as 0.1 eV, indicating that the metal-to-insulator transitionis driven by the electron correlation. The complex low-temperatureantiferromagnetic spin arrangement, reminiscent of those observed in somenickelates and manganites, suggests a long range orbital order.Comment: REVTeX 4 style; 5 pages, 4 figure

physical review. b, condensed matter and materials physics

Impurity-induced transition to a Mott insulator in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Ru</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>

Impurity-induced transition to a Mott insulator inSr3Ru2O7