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  • Letter
  • Open Access

Braided Ising spin-tube physics in a purported kagome magnet

J. Nagl1,*, D. Flavián1, B. Duncan1, S. Hayashida2, O. Zaharko3, E. Ressouche4, J. Ollivier5, Z. Yan1, S. Gvasaliya1 et al.

A. Zheludev1,†

  • 1Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
  • 2Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
  • 3Laboratory for Neutron Scattering and Imaging, PSI Center for Neutron and Muon Sciences, Forschungsstrasse 111, 5232 Villigen, PSI, Switzerland
  • 4Université Grenoble Alpes, CEA, IRIG, MEM, MDN, 38000 Grenoble, France
  • 5Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France

  • *Contact author: jnagl@ethz.ch
  • †Contact author: zhelud@ethz.ch; http://www.neutron.ethz.ch/

Phys. Rev. B 111, L180406 – Published 16 May, 2025

DOI: https://doi.org/10.1103/PhysRevB.111.L180406

Abstract

The magnetic insulator Nd3BWO9 has been previously proposed to realize the highly frustrated breathing kagome lattice model. We report a combination of single-crystal neutron scattering studies and numerical simulations that debunk this interpretation. We show that it is the interplane couplings that determine the physics. To explain the exotic magnetism, we derive a simple one-dimensional Ising model composed of twisted triangular spin tubes, i.e., triple braids of Ising spin chains with almost-orthogonal anisotropy frames and competing ferro-antiferromagnetic interactions. This model can account for the ground state, excitations, the numerous field-induced fractional magnetization plateau phases, and incommensurate magnetic correlations at elevated temperatures. Nd3BWO9 constitutes a rare example where rich magnetic phenomena can be understood and simulated quantitatively in terms of a simple classical Hamiltonian.

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