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, and Y. Tokura
Phys. Rev. B 72, 092404 – Published 8 September 2005

Abstract

The electrical, magnetic, and structural properties of Sr3(Ru1xMnx)2O7(0x0.2) 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.

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  • Received 28 April 2005

DOI:https://doi.org/10.1103/PhysRevB.72.092404

©2005 American Physical Society

Authors & Affiliations

R. Mathieu1,*, A. Asamitsu1,2, Y. Kaneko1, J. P. He1, X. Z. Yu1, R. Kumai3, Y. Onose1, N. Takeshita3, T. Arima1,4, H. Takagi3,5,6, and Y. Tokura1,3,7

  • 1Spin Superstructure Project (ERATO-SSS), JST, AIST Central 4, Tsukuba 305-8562, Japan
  • 2Cryogenic Research Center (CRC), University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan
  • 3Correlated Electron Research Center (CERC), AIST Central 4, Tsukuba 305-8562, Japan
  • 4Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
  • 5Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8581, Japan
  • 6CREST, Japan Science and Technology Corporation (JST)
  • 7Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan

  • *Permanent address: Cryogenic Center, University of Tokyo, Tokyo 113-0032, Japan. Electronic address: roland@crc.u-tokyo.ac.jp

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Issue

Vol. 72, Iss. 9 — 1 September 2005

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