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    Topological Nernst Effect of the Two-Dimensional Skyrmion Lattice

    Max Hirschberger1,2,*, Leonie Spitz1,†, Takuya Nomoto2, Takashi Kurumaji1,‡, Shang Gao1,§, Jan Masell1, Taro Nakajima1,∥, Akiko Kikkawa1, Yuichi Yamasaki3,4 et al.

    Hajime Sagayama5, Hironori Nakao5, Yasujiro Taguchi1, Ryotaro Arita2, Taka-hisa Arima1,6, and Yoshinori Tokura1,2,7

    • 1RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
    • 2Department of Applied Physics and Quantum-Phase Electronics Center, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
    • 3Research and Services Division of Materials Data and Integrated System (MaDIS), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
    • 4PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
    • 5Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
    • 6Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
    • 7Tokyo College, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan

    • *hirschberger@ap.t.u-tokyo.ac.jp
    • †Present address: Physik-Department, Technical University of Munich, Garching 85748, Germany.
    • ‡Present address: Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
    • §Present address: Materials Science & Technology Division and Neutron Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
    • ∥Present address: Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan.
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    Phys. Rev. Lett. 125, 076602 – Published 12 August, 2020

    DOI: https://doi.org/10.1103/PhysRevLett.125.076602

    Abstract

    The topological Hall effect (THE) and its thermoelectric counterpart, the topological Nernst effect (TNE), are hallmarks of the skyrmion lattice phase (SkL). We observed the giant TNE of the SkL in centrosymmetric Gd2PdSi3, comparable in magnitude to the largest anomalous Nernst signals in ferromagnets. Significant enhancement (suppression) of the THE occurs when doping electrons (holes) to Gd2PdSi3. On the electron-doped side, the topological Hall conductivity approaches the characteristic threshold ∼1000  (Ω cm)−1 for the intrinsic regime. We use the filling-controlled samples to confirm Mott’s relation between TNE and THE and discuss the importance of Gd-5d orbitals for transport in this compound.

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    Phys. Rev. Lett. 125, 076602– Published 12 August, 2020
    • Received 8 October 2019
    • Revised 16 May 2020
    • Accepted 10 July 2020
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