Dimensional reduction and incommensurate dynamic correlations in the $$S=\frac{1}{2}$$ S = 1 2 triangular-lattice antiferromagnet Ca3ReO5Cl2

S. A. Zvyagin (), A. N. Ponomaryov, J. Wosnitza, D. Hirai, Z. Hiroi, M. Gen, Y. Kohama, A. Matsuo, Y. H. Matsuda and K. Kindo
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S. A. Zvyagin: Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf
A. N. Ponomaryov: Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf
J. Wosnitza: Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf
D. Hirai: University of Tokyo
Z. Hiroi: University of Tokyo
M. Gen: University of Tokyo
Y. Kohama: University of Tokyo
A. Matsuo: University of Tokyo
Y. H. Matsuda: University of Tokyo
K. Kindo: University of Tokyo

Nature Communications, 2022, vol. 13, issue 1, 1-6

Abstract: Abstract The observation of spinon excitations in the $$S=\frac{1}{2}$$ S = 1 2 triangular antiferromagnet Ca3ReO5Cl2 reveals a quasi-one-dimensional (1D) nature of magnetic correlations, in spite of the nominally 2D magnetic structure. This phenomenon is known as frustration-induced dimensional reduction. Here, we present high-field electron spin resonance spectroscopy and magnetization studies of Ca3ReO5Cl2, allowing us not only to refine spin-Hamiltonian parameters, but also to investigate peculiarities of its low-energy spin dynamics. We argue that the presence of the uniform Dzyaloshinskii-Moriya interaction (DMI) shifts the spinon continuum in momentum space and, as a result, opens a zero-field gap at the Γ point. We observed this gap directly. The shift is found to be consistent with the structural modulation in the ordered state, suggesting this material as a perfect model triangular-lattice system, where a pure DMI-spiral ground state can be realized.

Date: 2022
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DOI: 10.1038/s41467-022-33992-5

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