Influence of the lattice geometry on the thermodynamical properties of two-dimensional spin systems

Various types of mixed spin two-dimensional Heisenberg networks are investigated by means of Monte Carlo simulations. This study aims at interpreting quantitatively the thermodynamical properties of two-dimensional molecule-based magnets recently synthesized. The proposed model requires that: (i) on...

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Hauptverfasser: Mombelli, B, Kahn, O, Leandri, J, Leroyer, Y, Mechkov, S, Meurdesoif, Y
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Kahn, O
Leandri, J
Leroyer, Y
Mechkov, S
Meurdesoif, Y
description Various types of mixed spin two-dimensional Heisenberg networks are investigated by means of Monte Carlo simulations. This study aims at interpreting quantitatively the thermodynamical properties of two-dimensional molecule-based magnets recently synthesized. The proposed model requires that: (i) one of the two magnetic centers has a spin large enough to be treated as a classical spin; (ii) the zero field Hamiltonian is isotropic; (iii) the quantum spins have only classical spins as neighbours. The quantum Hamiltonian is then replaced by a classical one with effective ferromagnetic interactions. The temperature dependence of both the specific heat and magnetic susceptibility are calculated. The effect of the lattice geometry is analysed.
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title Influence of the lattice geometry on the thermodynamical properties of two-dimensional spin systems
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