INTEGRABLE SPIN CHAINS ASSOCIATED WITH SL(Q)(N) AND SL(P,Q)(N)

The Hopf structure of the central extension of the U-q(sl(n)) algebra is considered. The intertwine matrix induces new integrable spin chain models. We show the relation of these models and the biparametric spin chain sl(p,q)(n) models. The cases n = 2 are n = 3 are discussed, and for n = 2 we obtain the model of Dasgupta and Chowdhury. The case n = 3 is solved by the nested Bethe ansatz method, and the dependence of the Bethe equations on the second parameter introduced is demonstrated.