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Thermodynamics of Integrable Chains with Alternating Spins | | H.J. de Vega
; Luca Mezincescu
; Rafael I. Nepomechie
; | | Date: |
8 Mar 1993 | | Journal: | Phys.Rev. B49 (1994) 13223-13226 | | Subject: | hep-th cond-mat | | Abstract: | We consider a two-parameter $(ar c, ilde c)$ family of quantum integrable Hamiltonians for a chain of alternating spins of spin $s=1/2$ and $s=1$. We determine the thermodynamics for low-temperature $T$ and small external magnetic field $H$, with $T << H$. In the antiferromagnetic $(ar c > 0, ilde c > 0)$ case, the model has two gapless excitations. In particular, for $ar c = ilde c$, the model is conformally invariant and has central charge $c_{vir} = 2$. When one of these parameters is zero, the Bethe Ansatz equations admit an infinite number of solutions with lowest energy. | | Source: | arXiv, hep-th/9303043 | | Services: | Forum | Review | PDF | Favorites | |
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