Document Type

Article

Publication Date

1994

Abstract

We consider a two-parameter (c¯,c̃) family of quantum integrable isotropic 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 (c¯>0,c̃>0) case, the model has two gapless excitations. In particular, for c¯=c̃, the model is conformally invariant and has central charge cvir=2. When one of these parameters is zero, the Bethe ansatz equations admit an infinite number of solutions with lowest energy.

Comments

H. J. de Vega, Luca Mezincescu, and Rafael I. Nepomechie, Physical Review B, 49, 13223-13226, 1994. "Copyright © 1994 by the American Physical Society.”

Link to the online abstract: http://link.aps.org/doi/10.1103/PhysRevB.49.13223

DOI: 10.1103/PhysRevB.49.13223

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