An antiferromagnet is characterized by the fact that the exchange integral \(J\) is negative, which tends to align neighboring spins antiparallel to one another. Assume that a given lattice structure is such that the whole lattice can be divided into two interpenetrating sublattices, \(a\) and \(b\), say, so that the spins belonging to each sublattice, \(a\) as well as \(b\), tend to align themselves in the same direction, while the directions of alignment in the two sublattices are opposite to one another. Using the Ising as well as Heisenberg type of interaction and working in the mean field approximation, evaluate the paramagnetic susceptibility of such a lattice at high temperatures.