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Impurity-induced transition to a Mott insulator in Sr$_3$Ru$_2$O$_7$

R. Mathieu·A. Asamitsu·Y. Kaneko·J. P. He·X. Z. Yu·R. Kumai·Y. Onose·N. Takeshita·T. Arima·H. Takagi·Y. Tokura
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Abstract

The electrical, magnetic, and structural properties of Sr$_3$(Ru$_{1-x}$Mn$_x$)$_2$O$_7$ (0 $\leq x \leq$ 0.2) are investigated. The parent compound Sr$_3$Ru$_2$O$_7$ 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.

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R. Mathieu, A. Asamitsu, Y. Kaneko, J. P. He, X. Z. Yu, R. Kumai, Y. Onose, N. Takeshita, T. Arima, H. Takagi, Y. Tokura. 2005-09-09. Impurity-induced transition to a Mott insulator in Sr$_3$Ru$_2$O$_7$. https://doi.org/10.1103/physrevb.72.092404

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