Random field effects on the phase diagrams of spin-1/2 Ising model on a honeycomb lattice

Details Random field effects on the phase diagrams of spin-1/2 Ising model on a honeycomb lattice Random field effects on the phase diagrams of spin-1/2 Ising model on a honeycomb lattice

2010-12-29

arxiv.org/abs/1101.0014v1

Physica A 391 (2012) 415-422

Physics

Condensed Matter

Statistical Mechanics

7 pages, 9 figures

Scientific paper

10.1016/j.physa.2011.09.009

Ising model with quenched random magnetic fields is examined for single Gaussian, bimodal and double Gaussian random field distributions by introducing an effective field approximation that takes into account the correlations between different spins that emerge when expanding the identities. Random field distribution shape dependence of the phase diagrams, magnetization and internal energy is investigated for a honeycomb lattice with a coordination number q=3. The conditions for the occurrence of reentrant behavior and tricritical points on the system are also discussed in detail.

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