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Dimensional reduction and incommensurate dynamic correlations in the S=1/2 triangular-lattice antiferromagnet Ca3ReO5Cl2
2022, Zvyagin, S.A., Ponomaryov, A.N., Wosnitza, J., Hirai, D., Hiroi, Z., Gen, M., Kohama, Y., Matsuo, A., Matsuda, Y.H., Kindo, K.
The observation of spinon excitations in the 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.