Mixed Ising ferrimagnets with next-nearest-neighbour couplings on square lattices |
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Authors: | Selke W Ekiz C |
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Institution: | Institut für Theoretische Physik, RWTH Aachen University, and JARA-HPC, D-52056 Aachen, Germany. |
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Abstract: | We study Ising ferrimagnets on square lattices with antiferromagnetic exchange couplings between spins of values S = 1/2 and 1 on neighbouring sites, couplings between S = 1 spins at next-nearest-neighbour sites of the lattice and a single-site anisotropy term for the S = 1 spins. Using mainly ground state considerations and extensive Monte Carlo simulations, we investigate various aspects of the phase diagram, including compensation points, critical properties and temperature-dependent anomalies. In contrast to previous belief, the next-nearest-neighbour couplings, when being of antiferromagnetic type, may lead to compensation points. |
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