Nonlinear Integral Equations for Thermodynamics of the Uq(sl(r+1)) Perk-Schultz Model

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We propose a system of nonlinear integral equations (NLIE) which describes the thermodynamics of the Uq(sl(r+1)) Perk-Schultz model. These NLIE correspond to a trigonometric analogue of our previous result (cond-mat/0212280), and contain only r unknown functions. In particular, they reduce to Takahashi's NLIE for the XXZ spin chain (cond-mat/0010486) if r=1. We also calculate the high temperature expansion of the free energy. In particular for r=1 case, we have succeeded to derive the coefficients of order O((J/T)⁹⁹).