F111. Microstructure of high Tc superconducting RuSr2GdCu2Ox
HRTEM image of ferromagnetic superconductor RuSr2GdCu2Ox, viewed down the [001] zone axis showing rectangular antiphase boundaries. [A. C. McLaughlin, W. Zhou, J. P. Attfield, A. N. Fitch, J. L. Tallon, Phys. Rev. B, 60, 7512-6 (1999)].