Finite-size effects in Heisenberg antiferromagnetic films with a body-centered cubic lattice

High-temperature series expansions of the zero-field free energy and staggered susceptibility are calculated for spin-(formula presented) Heisenberg antiferromagnetic bcc lattice films consisting of (formula presented) 3, 4, 5, and 6 interacting layers. Sixth order series in (formula presented) have been obtained for free-surface boundary conditions. The staggered susceptibility series is analyzed by using the ratio and Padé approximant techniques. The critical temperatures (formula presented) as a function of the number of m spin layers in the films are obtained. The shifts of the critical temperatures from the bulk value (formula presented) can be described by a power law (formula presented) with (formula presented) where λ is the inverse of the correlation length exponent. A comparison is made with related works.