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High-field depinned phase and planar Hall effect in the skyrmion host Gd2PdSi3

Max Hirschberger1,2,*, Taro Nakajima1,2,†, Markus Kriener2, Takashi Kurumaji2,‡, Leonie Spitz2,3,§, Shang Gao2,¶, Akiko Kikkawa2, Yuichi Yamasaki4,5, Hajime Sagayama6 et al.

Hironori Nakao6, Seiko Ohira-Kawamura7, Yasujiro Taguchi2, Taka-hisa Arima8, and Yoshinori Tokura1,2,9

  • 1Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 2RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
  • 3Physik-Department, Technical University of Munich, 85748 Garching, Germany
  • 4Research and Services Division of Materials Data and Integrated System (MaDIS), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
  • 5PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
  • 6Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
  • 7Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195, Japan
  • 8Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
  • 9Tokyo College, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan

  • *hirschberger@ap.t.u-tokyo.ac.jp
  • †Present address: Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan.
  • ‡Present address: Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  • §Present address: Physik-Department E51, Technische Universität München, D-85748 Garching, Germany.
  • Present address: Materials Science & Technology Division and Neutron Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
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Phys. Rev. B 101, 220401(R) – Published 1 June, 2020

DOI: https://doi.org/10.1103/PhysRevB.101.220401

Abstract

For the skyrmion-hosting intermetallic Gd2PdSi3 with centrosymmetric hexagonal lattice and triangular net of rare earth sites, we report a thorough investigation of the magnetic phase diagram. Our work reveals a magnetic phase with an isotropic value of the critical field for all orientations, where the magnetic ordering vector q is depinned from its preferred directions in the basal plane. The bulk nature of the skyrmion lattice and of other magnetic phases was evidenced by specific-heat measurements. Resistivity anisotropy, likely originating from partial gapping of the density of states along q in this Ruderman-Kittel-Kasuya-Yosida magnet, is picked up via the planar Hall effect (PHE). The PHE confirms the single-q nature of the magnetic order when the field is in the hexagonal plane, and allows one to detect the preferred directions of q. Several scenarios for the depinned phase, such as tilted conical order, are discussed on the basis of the data.

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References (29)

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Phys. Rev. B 101, 220401(R)– Published 1 June, 2020
  • Received 3 February 2020
  • Revised 10 April 2020
  • Accepted 28 April 2020
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