Journal of Physics A: Mathematical and General vol. 34, no. 13, pp. 2787 - 2799
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Abstract
We obtain an integrable two-leg supersymmetric t-J model through the algebraic Bethe ansatz scheme in the BFF grading. In this model, the two t-J chains interact with each other via a coupling constant κ. The model reduces to a two-chain Heisenberg spin model when the bosonic degrees of freedom are turned off and to two decoupled t-J chains when κ = 0. The construction of the diagonalized Hamiltonian yields the Bethe ansatz equations. We also obtain thermodynamic Bethe ansatz equations and calculate the magnetic susceptibility at a weak magnetic field and at zero temperature.