Mixed Ising ferrimagnets with next-nearest-neighbour couplings on square lattices

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 groun...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2011-12, Vol.23 (49), p.496002-7
Main Authors: Selke, W, Ekiz, C
Format: Article
Language:English
Subjects:
Antiferromagnetism
Classical spin models
Compensation
Computer Simulation
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Couplings
Critical-point effects, specific heats, short-range order
Electromagnetic Fields
Exact sciences and technology
Ferrimagnets
General theory and models of magnetic ordering
Ising model
Lattices
Magnetic properties and materials
Magnets - chemistry
Monte Carlo Method
Phase Transition
Physics
Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
Temperature
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Summary: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.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/23/49/496002