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TT: Fachverband Tiefe Temperaturen
TT 87: Frustrated Magnets: Spin Liquids
TT 87.8: Vortrag
Freitag, 22. März 2024, 11:15–11:30, H 3010
Dimensional reduction and incommensurate dynamic correlations in the spin-1/2 triangular lattice antiferromagnet Ca3ReO5Cl2 — •S. A. Zvyagin1, A. N. Ponomaryov1, J. Wosnitza1,2, D. Hirai3, Z. Hiroi3, M. Gen3, Y. Kohama3, A. Matsuo3, Y. H. Matsuda3, and K. Kindo3 — 1HZDR, Germany — 2TU Dresden, Germany — 3ISSP, Japan
The observation of spinon excitations in the spin-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 to refine spin-Hamiltonian parameters and 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 in the Brillouin zone center. The observed gap 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.
[1] S.A. Zvyagin et al., Nat. Commun. 13, 6310 (2022)
Keywords: Quntum spin chain; Quanum spin liquid; Spinon continuum; Dzyaloshinskii-Moriya interaction; High-field electron spin resonance spectroscopy