Sfb 288 Differential Geometry and Quantum Physics

Abstract for Sfb Preprint No. 206

Ground State Structure and Low Temperature Behaviour of an Integrable Chain with AlternatingSpins

B. -D. Doerfel, St. Meissner

In this paper we continue the investigation of an anisotropic integrable spin chain, consisting of spins $s=1$ and $s=frac{1}{2}$, started in our paper cite{meissner}. The thermodynamic Bethe ansatz is analysed especially for the case, when the signs of the two couplings $ar{c}$ and $ ilde{c}$ differ. For the conformally invariant model ($ar{c}= ilde{c}$) we have calculated heat capacity and magnetic susceptibility at low temperature. In the isotropic limit our analysis is carried out further and susceptibilities are calculated near phase transition lines (at $T=0$).

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