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Journal of Physics A Mathematical and General

Triplet order parameters in triangular and honeycomb Ising models

Ian Graham Enting

Published Oct 1, 1977• 22 citations
Publisher

Abstract

It is shown that the ratios of certain triplet order parameters to magnetisation in honeycomb and diamond lattice Ising models can be easily calculated. Applying the star-triangle transformation reproduces the result obtained by Baxter (see ibid., vol.8, p.1797 (1975)) on the triangular lattice. The new derivation indicates that exact solutions for triplet order parameters are of only limited use as checks on series expansions.

DOI
10.1088/0305-4470/10/10/008

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Journal of Physics A Mathematical and General•Aug 1, 1984•4 citations
It is shown that the ratios of certain triplet order parameters to magnetisation in honeycomb and diamond lattice Ising models can be easily calculated. Applying the star-triangle transformation reproduces the result obtained by Baxter (see ibid., vol.8, p.1797 (1975)) on the triangular lattice. The new derivation indicates that exact solutions for triplet order parameters are of only limited use as checks on series expansions.
The "star-triangle" and "decoration" transformations are generalized so as to apply to arbitrary mechanical systems coupled to the spins of a standard Ising net. This leads to exact solutions for further plane Ising nets and also for lattices in which the spins on alternate sites have a magnitude greater than S=12S=\frac{1}{2}S=21​. A general class of antiferromagnetic Ising models is constructed; exact closed expressions can be derived for all the thermodynamic and magnetic properties of these models in an arbitrary magnetic field.The magnetizations and susceptibilities of Ising nets in which different spins have different magnetic moments are investigated and a valuable relation between the susceptibilities of the honeycomb and triangular lattices is derived. It is shown how correlation functions involving a given spin can be expressed in terms of correlations involving the nearest-neighbor spins instead.