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Uniaxial colossal magnetoresistance in the Ising magnet SrCo12O19

S. Ishiwata, T. Nakano, I. Terasaki, H. Nakao, Y. Murakami, Y. Uwatoko, and M. Takano
Phys. Rev. B 83, 020401(R) – Published 10 January 2011

Abstract

A new type of colossal magnetoresistance, which is extremely sensitive to the magnetic-field direction, was discovered in a magnetoplumbite-type hexagonal cobalt oxide SrCo12O19 synthesized under a high pressure of 3 GPa. SrCo12O19 has a unique combination of physical properties (i.e., uniaxial magnetic anisotropy originating from Ising spins on Co3+O5 bipyramids and a metal-insulator transition taking place on a three-dimensional network of Co3+/4+O6 octahedra). The resistivity decreases by a factor of 1000 when a magnetic field of 10 T is applied along the hexagonal axis (magnetic easy axis) in the insulating phase, whereas it is rather robust against the field perpendicular to this axis. These results demonstrate a metal-insulator crossover dominated by the orientation order of built-in Co3+ Ising spins embedded in the conductive Co3+/4+-O matrix lattice.

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  • Received 27 September 2010

DOI:https://doi.org/10.1103/PhysRevB.83.020401

© 2011 American Physical Society

Authors & Affiliations

S. Ishiwata1,*, T. Nakano1, I. Terasaki1, H. Nakao2, Y. Murakami2, Y. Uwatoko3, and M. Takano4

  • 1Department of Applied Physics, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
  • 2Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan
  • 3Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
  • 4Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Yoshida Ushinomiya-cho, Sakyo-ku, Kyoto 606-8501, Japan

  • *Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, 7-3-1, Hongo, Tokyo 113-8656, Japan; e-mail: ishiwata@ap.t.u-tokyo.ac.jp

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Issue

Vol. 83, Iss. 2 — 1 January 2011

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