Harold T. Stokes, Dorian M. Hatch, and Branton J. Campbell, Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84606, USA, stokesh@byu.edu

**Description**:
The ISOTROPY software suite
is a collection of software which applies group theoretical
methods to the analysis of phase transitions in crystalline solids.
**How to cite**: ISOTROPY Software Suite, iso.byu.edu.

**ISODISTORT**: Explore and visualize distortions of crystalline structures. Possible distortions include atomic displacements, atomic ordering, strain, and magnetic moments.**ISOSUBGROUP**: Interactive program using user-friendly interface to list isotropy subgroups.**ISOTROPY**: Interactive program using command lines to explore isotropy subgroups and their associated distortions.**SMODES**: Find the displacement modes in a crystal which brings the dynamical matrix to block-diagonal form, with the smallest possible blocks.**FROZSL**: Calculate phonon frequencies and displacement modes using the method of frozen phonons.

**ISOCIF**: Create or modify CIF files.**FINDSYM**: Identify the space group of a crystal, given the positions of the atoms in a unit cell.**ISO-IR**: Tables of Irreducible Representations. The 2011 version of IR matrices.**ISO-MAG**: Tables of magnetic space groups, both in human-readable and computer-readable forms.

**ISO(3+d)D**: (3+d)-Dimensional Superspace Groups for d=1,2,3**ISO(3+1)D**: Isotropy Subgroups for Incommensurately Modulated Distortions in Crystalline Solids: A Complete List for One-Dimensional Modulations**FINDSSG**: Identify the superspace group symmetry given a list of symmetry operators.**TRANSFORMSSG**: Transform a superspace group to a new setting.

**COPL**: Find a complete list of order parameters for a phase transition, given the space-group symmetries of the parent and subgroup phases.**INVARIANTS**: Generate invariant polynomials of the components of order parameters.**COMSUBS**: Find common subgroups of two structures in a reconstructive phase transition

**ISOTROPY Software Suite for Linux**: includes ISOTROPY, FINDSYM, SMODES, COMSUBS.

53rd course of the International School of Crystallography |