Figure 5. Perfect single crystals emerging from imperfect interfaces.
(a), Full-width-at-half-maximum (FWHM) of the Ge(115) peak (ΔQx) and tilt (χx) along the Qx direction vs. crystal height. The experimental data are fitted with asymptotic exponential functions, , where a is positive and negative for y
= ΔQx and y
= χx, respectively (dashed black and blue lines). (b–d), Cross-sections through the Ge(115) peak along Qx at 3 different crystal heights (e.g. I, II and III) depicted in (a). The experimental data are fitted to single Gaussians.