تحلیل ساختاری نمایه‌های پراش از نمونه‌های دوقلویی در ابررسانای دمای بالا

 In this study we introduce a new analytical expression for the intensity distribution of the diffraction patterns from a twined sample of YBCOx ( YBa2Cu3O6+x, 0<x<1). It is concluded that because of the interference between the diffracted rays from two adjacent twin lamellas, a discernable central peak (c.p) shows up which its intensity depends on the orthorhombicity (S) and the mean width of the twin lamellas (T). Researchers who are interested in all kinds of structural transitions involving a reduction in crystal symmetry may find it necessary to consider the twin’s lamella width as a new kind of order parameter.