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New analytic results are presented for the low-T thermodynamics of the Ising-Heisenberg linear ferromagnetic in a magnetic field H₀. For small H₀ the thermodynamic functions show unexpected and interesting structure as a function of H₀ and the anisotropy Δ. The thermal and magnetic energy gaps have singularities, not necessarily at the same Δ-H₀ location, as changes occur in the type of excitation dominating the low-T behavior. The results may relate to quantum solitons in the linear ferromagnet.
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Johnson et al. (1980) studied this question.
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