Abstract
The exact partition function, free energy, pair-correlation function, and connected quantities like entropy, specific heat, and magnetic susceptibility were deduced for an Ising chain in which each spin interacts with its mirror-image spin and the neighbors of the image. A qualitatively different behavior was found for the pair-correlation function in low- and high-temperature limits, which was interpreted in terms of bound spin pairs emerging in the low-T regime. The physical implications of the model are analyzed, and applications in condensed matter and biology discussed. \textcopyright{} 1996 The American Physical Society.
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