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Frustrated Magnetism in a 2-D Ytterbium Fluoride
journal contribution
posted on 2019-08-23, 21:13 authored by Ningxin Jiang, Henry S. La PierreGeometric frustration
of magnetic ions combines with spin–orbit coupling and structural
disorder to give rise to potentially, highly entangled magnetic states
such as quantum spin liquids. While fluoride-based frustrated magnets
are common in the d-block, in the f-block, fluoride-based frustrated
magnets are extremely rare. Herein, we report the synthesis of KYb2F5SO4, a fluoride-based distorted triangular
lattice antiferromagnet with no structural disorder but significant
geometric distortion from an ideal triangular lattice. In KYb2F5SO4, no long-range ordering can be
observed down to 0.10 K, and the low-temperature Curie–Weiss
temperature θcw = −0.46(2) K yields a frustration
parameter of greater than 4.6. The magnetic entropy released at low
temperature indicates an effective spin-1/2 Kramer’s doublet
ground state. However, the low saturation field and incomplete recovery
of magnetic entropy down to 0.10 K under zero-field imply weak quantum
entanglement.