Programs in Physics & Physical Chemistry
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|Manuscript Title: Fortran code for the three-dimensional Ising model on body-centered cubic and face-centered cubic lattices.|
|Authors: J.-M. Drouffe, K.J.M. Moriarty|
|Program title: BCC64|
|Catalogue identifier: ABFY_v1_0|
Distribution format: gz
|Journal reference: Comput. Phys. Commun. 52(1989)249|
|Programming language: Fortran.|
|Computer: CDC CYBER 205(MODEL 642).|
|Operating system: CDC CYBER 200 VSOS 2.3.5.|
|RAM: 13K words|
|Word size: 64|
|Keywords: Statistical physics, Thermodynamics, Ising model, Phase transitions, Critical exponents, Correlation functions, Magnetization, Microcanonical methods, Regular lattices, Body-centered cubic, Face-centered cubic, Universality.|
Nature of problem:
Universality is the principle whereby the important physical parameters associated with the ferromagnetic phase transition in the three- dimensional Ising model, e.g., the critical exponents, are independent of the regular cubic lattice used for the calculations. We wish to establish universality for the three-dimensional Ising model.
The three-dimensional Ising model with the microcanonical method with demons, previously formulated on the simple cubic regular lattice, is reformulated on the body-centered cubic (b.c.c.) and face-centered cubic (f.c.c.) regular lattices.
As with our previous simple cubic regular lattice programs, the only restriction on the program is the amount of CPU time required, which is large. This requirement is dictated by the size of the errors in our critical exponents needed for present-day calculations. Again there is no restriction on the fast memory because very little of the memory is used.
The test runs on a 8**2*64 lattice with 10 sweeps through the lattice took 3.12 and 3.86 secs for the b.c.c. and f.c.c. lattices, respectively, on the CDC CYBER 205.
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