Exact solution of new integrable nineteen-vertex models and quantum spin-1 chains

Abstract

New exactly solvable nineteen vertex models and related quantum spin-1 chains are solved. Partition functions, excitation energies, correlation lengths, and critical exponents are calculated. It is argued that one of the non-critical Hamiltonians is a realization of an integrable Haldane system. The finite-size spectra of the critical Hamiltonians deviate in their structure from standard predictions by conformal invariance.

16 pages, to appear in Z. Phys. B, preprint Cologne-94-4746

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