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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.

Restrictions:
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.