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Manuscript Title: Fortran code for the three-dimensional Ising model.
Authors: M. Creutz, K.J.M. Moriarty
Program title: MICROIS
Catalogue identifier: AADW_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 39(1986)173
Programming language: Fortran.
Computer: CDC CYBER 170-730.
Operating system: CDC NOS 2.2.
RAM: 25K words
Word size: 60
Keywords: Solid state physics, Other, Ising model, Phase transitions, Critical exponents, Correlation functions, Magnetization, Microcanonical methods, Statistical physics, Thermodynamics.
Classification: 7.7, 23.

Nature of problem:
The program calculates equilibrium distributions for the elementary magnets in a large three-dimensional Ising model system so that the critical inverse temperature and critical exponents can be measured.

Solution method:
An essentially deterministic technique called the microcanonical method with demons is used to obtain equilibriated elementary magnetic configurations. Spin correlations at a variety of separations can be measured.

In order to reduce the errors on our measurements, reasonably long run times are required which is the only restriction on the use of the program. Primary memory is not a restriction as very little memory is required.

Running time:
The test run on an 8**2 * 120 lattice with 10 iterations through the lattice, each with 10 sweeps, took 3.2 secs. on the CDC CYBER 170-730.