COPL

Version 1.1, Apr 2009
Harold T. Stokes and Dorian M. Hatch, Department of Physics and Astronomy, Brigham Young University, Provo, Utah, 84602, USA, stokesh@byu.edu

Description: Find a complete list of order parameters, given the space-group symmetries of the parent and subgroup in a phase transition.
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How to cite COPL: ISOTROPY Software Suite, iso.byu.edu.
Also D. M. Hatch and H. T. Stokes, "COPL: Program for Obtaining a Complete List of Order Parameters for a Group-Subgroup Crystalline Phase Transition." J. Appl. Cryst. 35, 379 (2002)
And D. M. Hatch and H. T. Stokes, "The Complete Listing of Order Parameters for a Crystalline Phase Transition: A Solution to the Generalized Landau Problem." Phys. Rev. B 65, 014113-1-4 (2002).

Below, default input is given as an example. You may submit this form as given to see the output of this example.

Parent space group:

Subgroup space group:

Lattice vectors of subgroup in terms of lattice vectors of parent:


Origin of subgroup with respect to parent in terms of lattice vectors of parent:

Click to submit data:

Click to reset data: