Direct Observation of Localized Spin Antiferromagnetic Transition in PdCrO$_2$ by Angle-Resolved Photoemission Spectroscopy

ORAL

Abstract

We report the first case of the successful measurements of a localized spin antiferromagnetic transition in delafossite-type PdCrO$_2$ by angle-resolved photoemission spectroscopy (ARPES). This demonstrates how to circumvent the shortcomings of ARPES for investigation of magnetism involved with localized spins in limited size of two-dimensional crystals or multi-layer thin films that neutron scattering can hardly study due to lack of bulk compared to surface. Also, our observations give direct evidence for the spin ordering pattern of Cr$^{3+}$ ions in PdCrO$_2$ suggested by neutron diffraction and quantum oscillation measurements, and provide a strong constraint that has to be satisfied by a microscopic mechanism for the unconventional anomalous Hall effect recently reported in this system.

*This work was supported by the National Research Foundation (NRF) of Korea Grant funded by the Korean Government (MEST) (Nos. 2010-0010771 and 2012M2B2A4029607). K.K. and B.I.M. acknowledge the support of NRF (Nos. 2009-0079947 and 2011-0025237) and KISTI

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Authors

  • Han-Jin Noh

    • Department of Physics, Chonnam National University, Gwangju

  • Jinwon Jeong

    • Department of Physics, Chonnam National University, Gwangju

  • Bin Chang

    • Department of Physics, Chonnam National University, Gwangju

  • Dahee Jeong

    • Department of Physics, Chonnam National University, Gwangju

  • Hyun Sook Moon

    • Department of Physics, Chonnam National University, Gwangju

  • En-Jin Cho

    • Department of Physics, Chonnam National University, Gwangju

  • Jong Mok Ok

    • Department of Physics, Pohang University of Science and Technology, Pohang

  • Jun Sung Kim

    • Department of Physics, Pohang University of Science and Technology, Pohang

  • Kyoo Kim

    • Department of Physics, Pohang University of Science and Technology, Pohang

  • B.I. Min

    • Department of Physics, Pohang University of Science and Technology, Pohang

  • Han-Koo Lee

    • Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang

  • Jae-Young Kim

    • Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang

  • Byeong-Gyu Park

    • Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang

  • Hyeong-Do Kim

    • Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang

  • Seongsu Lee

    • Korea Atomic Energy Research Institute, Daejeon