Sfb 288 Differential Geometry and Quantum Physics

Abstract for Sfb Preprint No. 225

Finite-size corrections of an integrable chain with alternating spins

B.-D. Doerfel and St. Meissner

In this paper we calculate the finite-size corrections of an anisotropic integrable spin chain, consisting of spins $s=1$ and $s=frac{1}{2}$. The calculations are done in two regions of the phase diagram with respect to the two couplings $ar{c}$ and $ ilde{c}$. In case of conformal invariance we obtain the final answer for the ground state and its lowest excitations, which generalizes earlier results.

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