Frustrated Magnetism in a 2-D Ytterbium Fluoride
Posted on 2019-08-23 - 21:13
Geometric 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.
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Jiang, Ningxin; La Pierre, Henry S. (2019). Frustrated Magnetism in a 2-D Ytterbium Fluoride. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.9b01489
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