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Frustration model and spin excitations in the helimagnet FeP

A. S. Sukhanov, Y. V. Tymoshenko, A. A. Kulbakov, A. S. Cameron, V. Kocsis, H. C. Walker, A. Ivanov, J. T. Park, V. Pomjakushin, S. E. Nikitin, I. V. Morozov, I. O. Chernyavskii, S. Aswartham, A. U. B. Wolter, A. Yaresko, B. Büchner, and D. S. Inosov
Phys. Rev. B 105, 134424 – Published 20 April 2022
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Abstract

The metallic compound FeP belongs to the class of materials that feature a complex noncollinear spin order driven by magnetic frustration. While its double-helix magnetic structure with a period λs5c, where c is the lattice constant, was previously well determined, the relevant spin-spin interactions that lead to that ground state remain unknown. By performing extensive inelastic neutron scattering measurements, we obtained the spin-excitation spectra in a large part of the momentum-energy space. The spectra show that the magnons are gapped with a gap energy of 5meV. Despite the 3D crystal structure, the magnon modes display strongly anisotropic dispersions, revealing a quasi-one-dimensional character of the magnetic interactions in FeP. The physics of the material, however, is not determined by the dominating exchange, which is ferromagnetic. Instead, the weaker two-dimensional antiferromagnetic interactions between the rigid ferromagnetic spin chains drive the magnetic frustration. Using linear spin-wave theory, we were able to construct an effective Heisenberg Hamiltonian with an anisotropy term capable of reproducing the observed spectra. This enabled us to quantify the exchange interactions in FeP and determine the mechanism of its magnetic frustration.

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  • Received 25 January 2022
  • Accepted 5 April 2022

DOI:https://doi.org/10.1103/PhysRevB.105.134424

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. S. Sukhanov1, Y. V. Tymoshenko1,*, A. A. Kulbakov1, A. S. Cameron1, V. Kocsis2, H. C. Walker3, A. Ivanov4, J. T. Park5, V. Pomjakushin6, S. E. Nikitin7, I. V. Morozov2, I. O. Chernyavskii2, S. Aswartham2, A. U. B. Wolter2, A. Yaresko8, B. Büchner1,2,9, and D. S. Inosov1,9,†

  • 1Institut für Festkörper- und Materialphysik, Technische Universität Dresden, D-01069 Dresden, Germany
  • 2Institut für Festkörperforschung, Leibniz IFW-Dresden, D-01069 Dresden, Germany
  • 3ISIS Facility, STFC, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11-0QX, United Kingdom
  • 4Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
  • 5Heinz Maier-Leibnitz Zentrum (MLZ), TU München, D-85747 Garching, Germany
  • 6Laboratory for Neutron Scattering and Imaging (LNS), Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
  • 7Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
  • 8Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 9Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter—ct.qmat, Technische Universität Dresden, 01069 Dresden, Germany

  • *Present address: Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.
  • Corresponding author: dmytro.inosov@tu-dresden.de

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Issue

Vol. 105, Iss. 13 — 1 April 2022

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