CeTa7O19 and YbTa7O19 are disorder-free triangular-lattice magnets with effective spin-1/2 ground states, contrasting easy-axis and easy-plane anisotropy, and very weak antiferromagnetic exchange.
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Structural and magnetic characterization of CeTa$_7$O$_{19}$ and YbTa$_7$O$_{19}$ with two-dimensional pseudospin-1/2 triangular lattice
CeTa7O19 and YbTa7O19 are disorder-free triangular-lattice magnets with effective spin-1/2 ground states, contrasting easy-axis and easy-plane anisotropy, and very weak antiferromagnetic exchange.