YbCuSe2 realizes a quantum spin liquid ground state with dynamical phase separation below 0.7 K and roton-like excitations between 4.5 K and 1.8 K inferred from muon spin relaxation.
Ding , author P
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Degenerate perturbation theory on a multiorbital Hubbard model shows isotropic superexchange arises mainly from ground-state Kramers doublet hopping while anisotropy comes from excited multiplets, yielding an orbital design rule for quasi-isotropic exchange in rare-earth insulators.
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Quantum spin liquid ground state with the evidence of roton-like excitations at elevated temperatures in the triangular-lattice delafossite YbCuSe$_2$
YbCuSe2 realizes a quantum spin liquid ground state with dynamical phase separation below 0.7 K and roton-like excitations between 4.5 K and 1.8 K inferred from muon spin relaxation.
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Design Principles for Quasi-Isotropic Exchange in Rare-Earth Quantum Magnets
Degenerate perturbation theory on a multiorbital Hubbard model shows isotropic superexchange arises mainly from ground-state Kramers doublet hopping while anisotropy comes from excited multiplets, yielding an orbital design rule for quasi-isotropic exchange in rare-earth insulators.