We give two soluble models which contain critical points of order four — one order more complex than tricritical points or the tetracritical point presented to this conference two years ago by Nagle and Bonner. The models are one dimensional Ising models with a long‐range interaction; one contains one staggered magnetic field, the other two such fields. The formal solutions are given.
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© 1972 American Institute of Physics.
1972
American Institute of Physics
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