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arXiv:0810.4400 · Physica A Statistical Mechanics and its Applications

Phase transitions of the mixed spin-1/2 and spin- Ising model on a three-dimensional decorated lattice with a layered structure

Jozef Strečka, J. Dely, Lucia Čanová

Published Mar 13, 2009• 15 citations
arXivHTMLPDF
DOI
10.1016/j.physa.2009.03.006

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Phase transitions of the mixed spin-1/2 and spin-1 Ising-Heisenberg model on several decorated planar lattices consisting of interconnected diamonds are investigated within the framework of the generalized decoration-iteration transformation. The main attention is paid to the systematic study of the finite-temperature phase diagrams in dependence on the lattice topology. The critical behaviour of the hybrid quantum-classical Ising-Heisenberg model is compared with the relevant behaviour of its semi-classical Ising analogue. It is shown that both models on diamond-like decorated planar lattices exhibit a striking critical behaviour including reentrant phase transitions. The higher the lattice coordination number is, the more pronounced reentrance may be detected.