An elastic Ginzburg-Landau theory which includes strain and strain-gradient contributions is formulated for inhomogeneous strain fields associated with interface boundaries, heterophase inclusions, and transformation precursors. For proper purely ferroelastic materials of $D_{4h}$ symmetry, an explicit kink-type solitary-wave solution describing a moving coherent ($1\bar{1}0$) twin boundary is obtained.

• Received 1 May 1984

DOI:https://doi.org/10.1103/PhysRevLett.53.1069