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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SSD-based finite-size calculations show shoulder or double-peak specific heat in triangular and kagome antiferromagnets plus strong low-T susceptibility enhancement in kagome, indicating magnetic states dominate its excitations below 0.5J unlike the triangular case.
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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.
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Specific heat and susceptibility of S=1/2 antiferromagnets on square, triangular, and kagome lattices
SSD-based finite-size calculations show shoulder or double-peak specific heat in triangular and kagome antiferromagnets plus strong low-T susceptibility enhancement in kagome, indicating magnetic states dominate its excitations below 0.5J unlike the triangular case.