Abstract
A trial function for the ground state of the antiferromagnetic linear chain leads to an equation for an upper bound of the ground-state energy per spin. This equation is solved exactly.
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van de Braak, H.P., Caspers, W.J., Gragert, P.K.H. et al. An upper bound for the ground-state energy of an antiferromagnetic chain with next-nearest-neighbor interaction. J Stat Phys 20, 487–497 (1979). https://doi.org/10.1007/BF01012896
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DOI: https://doi.org/10.1007/BF01012896