Fig. 1: Ferroelastic domains in perovskite oxides.
From: Ferroelastic writing of crystal directions in oxide thin films
a, Atomic structure in side view of (001)-oriented perovskite oxides with orthorhombic or monoclinic structure. The lattice shears towards the x direction (red arrow), namely [100]. b, Top-view schematic of four different ferroelastic domains for (001)-oriented monoclinic or orthorhombic perovskites. X, \(\overline{X}\), Y and \(\overline{Y}\) indicate the ferroelastic domains shearing along the x, −x, y and −y directions, respectively. c, ECC image of as-grown SrRuO3 (001) thin films. The image was processed with false colours following the colour code in b. d, Atomic structure in side view of (111)-oriented perovskite oxides in the monoclinic structure. The lattice shears towards the x direction (red arrow), namely \([11\overline{2}]\). e, Top-view schematic of three-variant ferroelastic domains for (111)-oriented perovskite oxides. X1, X2 and X3 indicate the ferroelastic domains shearing along one of the equivalent \(\langle 11\overline{2}\rangle\) directions (marked as x1, x2 and x3). f, ECC image of as-grown SrRuO3 (111) thin films, which was processed with false colours following the colour code in e.
