Helical versus collinear antiferromagnetic order tuned by magnetic anisotropy in polar and chiral (Ni,Mn)3TeO6

Jaewook Kim, J. Yang, C. J. Won, Kyoo Kim, Bongjae Kim, D. Obeysekera, Dong Woo Lee, and Sang-Wook Cheong
Phys. Rev. Materials 5, 094405 – Published 13 September 2021
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Abstract

Polar and chiral Ni3TeO6 was found to exhibit a colossal magnetoelectric (ME) effect associated with collinear antiferromagnetic order. We have investigated the evolution of its magnetic state with the substitution of the Ni2+ spins by isotropic Mn2+ spins, namely (Ni,Mn)3TeO6 (NMTO). The ground state of NMTO maintains an Ising nature, but a new phase with XY-type magnetic anisotropy is discovered at an intermediate temperature range. Neutron powder diffraction experiments reveal that (1) Mn ions tend to occupy a specific transition-metal site, consistent with the first-principle calculation, and (2) the intermediate phase is an incommensurate (IC) helical magnetic state propagating along the c axis with qIC=(0,0,1.5±δ). We also found that the balance between these two magnetic states can be readily manipulated with magnetic fields, which results in significant ME effects. This selective site occupancy of NMTO allows for a unique competition between collinear and helical magnetic structures with minimal chemical disorder. Thus, NMTO serves as a model system to study site-specific chemical control of noncollinear magnetism and ME coupling.

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  • Received 7 June 2021
  • Accepted 31 August 2021

DOI:https://doi.org/10.1103/PhysRevMaterials.5.094405

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jaewook Kim1,2,*, J. Yang3, C. J. Won4, Kyoo Kim2, Bongjae Kim5, D. Obeysekera3, Dong Woo Lee2, and Sang-Wook Cheong1,4

  • 1Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
  • 2Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
  • 3Department of Physics, New Jersey Institute of Technology, Newark, New Jersey 07102, USA
  • 4Laboratory for Pohang Emergent Materials and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
  • 5Department of Physics, Kunsan University, Gunsan 54150, Republic of Korea

  • *jaewook@kaeri.re.kr

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Issue

Vol. 5, Iss. 9 — September 2021

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