Low-energy spin waves in the triangular-lattice antiferromagnet KCeS$_2$
Rare-earth delafossites were recently proposed as promising candidates for the realization of an effective S = 1/2 quantum spin liquid on the triangular lattice. In contrast to the most studied triangular-lattice antiferromagnet YbMgGaO4, which is known for very strong structural disorder due to site intermixing, Yb- and Ce-based delafossites NaYbS2, NaYbO2, and KCeS2 realize structurally perfect triangular layers with practically no distortions. In NaYbS2 and NaYbO2, magnetic order is absent down to mK temperatures, suggesting that these compounds may realize the long-sought spin-liquid ground state that can be destroyed by magnetic field that stabilizes long-range order. In contrast, KCeS2 was recently shown to develop magnetic order below 0.4 K already in zero field. We have recently established the magnetic structure of this ordered phase from neutron diffraction and are now proposing to measure spin-wave excitations to estimate the magnon band width and the essential magnetic interactions in the effective magnetic Hamiltonian of the system. Our goal is to understand the origin of the ordered state and why it is present in KCeS2 but not in the isostructural Yb compounds.
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The recommended format for citing this dataset in a research publication is in the following format:
Dmytro Inosov; DOERT Thomas; KULBAKOV Anton; OLLIVIER Jacques and Yuliia Tymoshenko. (2021). Low-energy spin waves in the triangular-lattice antiferromagnet KCeS$_2$. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1718
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