Abstract
Temperature-dependent polarized Cu K-edge x-ray absorption has been used to investigate local structural distortions in the plane of the system. The Cu-O pair distribution shows the presence of a minority phase containing octahedra characterized by a shorter Cu-O(apical) bond (ΔR∼-0.1 Å) and two longer Cu-O(planar) bonds (ΔR∼+0.08 Å) and a tilting angle of 16°±2°. The temperature-dependent distortions show a maximum around T (∼1.) and a minimum at (∼35 K). The data show the coexistence of two types of doped charges in different stripes in the superconducting phase.
DOI:https://doi.org/10.1103/PhysRevB.55.12759
©1997 American Physical Society