A NEW STRUCTURAL CHARACTERIZATION OF THE HIGH Tc SUPERCONDUCTING COMPOUND Bi_2Sr_2CaCu_2O_(8+δ)

摘要

Structural refinement of the incommensurate modulated Bi2Sr2CaCu20g+g compound has been performed using 1411 single-crystal X-ray diffraction data including first and second order satellites. Different models are discussed involving centra- or noncentrosymmetry, thermal motion or site occupancy modulation, and static disorder of the Bi atom. They are compared with previous descriptions of the same structure given in the literature.