An X-ray diffraction study of the incommensurate modulations in single crystal Bl_2·2Sr_1·8CaCu₂O_8-x

Abstract

High—resolution X—ray diffraction measurements were performed on a single crystal of Bl_2·2Sr_1·8CaCu₂O_8-x at room temperature. The intensity distribution in the vicinity of the odd 001 reciprocal lattice points is presented. Asymmetrical arrangements of the incommensurate peaks q₁ and q₂ are observed. In the vicinity of the odd reciprocal lattice points new incommensurate satellites q₃=-0·021b^*+0·016c^* with strong asymmetry of superlattice intensities are found.