Theory of antiferromagnetic superlattices at finite temperatures

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Abstract
Magnetic properties of antiferromagnetic superlattices at finite temperatures are investigated theoretically by a multisublattice Green-function technique which takes into account the quantum nature of Heisenberg spins. The results of various physical quantities and the magnetic transition temperature are shown for different sets of intraplane and interplane interactions. In particular, in the case of stacking of alternative weak and strong layers, we find a crossover between layer magnetizations due to quantum fluctuations at low temperatures, which has no counterpart in ferromagnetic superlattices. Monte Carlo simulations of the corresponding classical Heisenberg model spins have also been carried out, and a comparison between the two methods is given.