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Journal of Magnetism and Magnetic Materials

On the tricritical behaviour of disordered spin systems

Uwe Krey

Published Jan 1, 1980• 0 citations
Publisher
DOI
10.1016/0304-8853(80)91033-1

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PRSM•Jan 12, 2012•0 citations
The tricritical points on the nearest neighbour interaction mixed spin-½ and spin-1 transverse Ising system with a crystal field are investigated within the framework of the effective field theory (EFT) with correlations. Particular emphasis is given to the square lattice for which phase diagrams are obtained. If the transverse field varies in certain ranges, we find that tricritical points are obtained for the present system. The effect of the transverse field on the behaviour of the tricritical points is discussed in this paper.
The two dimensional mixed spin system consisting of spin-1/2 and spin-1 with four-spin interactions exhibits tricritical behaviour. The influence of a transverse field on this behaviour is studied with the finite cluster approximation based on a single-site cluster theory. The state equations are derived for the square lattice. It has been shown that the system keeps its tricritical behaviour, but when the strength of the transverse field approaches a critical value, all transitions become of second-order for any value of four-spin interaction.