Impurity-induced transition to a Mott insulator in Sr3Ru2O7

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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39 Citations (Scopus)


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.

Original languageEnglish
Article number092404
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number9
Publication statusPublished - 2005 Sept 1


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