THE INTERFACE TENSION OF THE 3-DIMENSIONAL ISING-MODEL IN THE SCALINGREGION

Using the Monte Carlo method, we determine the free energy of the inte rface of the 3D Ising model in the scaling region. By integrating the interface energies over the inverse temperature beta, we obtain estima tes for the free energies of interfaces with cross sections up to 96 x 96, and for a range 0.223 less than or equal to beta less than or equ al to 0.23. Our data yield a precise estimation of the interface tensi ons a. We determine the amplitude sigma(0) in the critical law sigma s imilar to sigma(0)t(mu) and estimate the combination sigma xi(2) which yields the universal constant R_ in the critical limit.