Temperature-dependent polarized Cu K-edge x-ray absorption has been used to investigate local structural distortions in the CuO2 plane of the La1.85Sr0.15CuO4 system. The Cu-O pair distribution shows the presence of a minority phase containing CuO6 octahedra characterized by a shorter Cu-O(apical) bond (Delta R similar to-0.1 Angstrom) and two longer Cu-O(planar) bonds (Delta R similar to+0.08 Angstrom) and a tilting angle of 16 degrees+/-2 degrees. The temperature-dependent distortions show a maximum around T* (similar to 1.6T(c)) and a minimum at T-c (similar to 35 K). The The data show the coexistence of two types of doped charges in different stripes in the superconducting phase.
Local Lattice Instability and Stripes in the CuO2 Plane of the La1.85Sr0.15CuO4 System by Polarized XANES and EXAFS / Saini, Naurang Lal; A., Lanzara; H., Oyanagi; H., Yamaguchi; K. OKA AND T., Ito; Bianconi, Antonio. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - 55:(1997), pp. 12759-12769. [10.1103/PhysRevB.55.12759]
Local Lattice Instability and Stripes in the CuO2 Plane of the La1.85Sr0.15CuO4 System by Polarized XANES and EXAFS.
SAINI, Naurang Lal;BIANCONI, Antonio
1997
Abstract
Temperature-dependent polarized Cu K-edge x-ray absorption has been used to investigate local structural distortions in the CuO2 plane of the La1.85Sr0.15CuO4 system. The Cu-O pair distribution shows the presence of a minority phase containing CuO6 octahedra characterized by a shorter Cu-O(apical) bond (Delta R similar to-0.1 Angstrom) and two longer Cu-O(planar) bonds (Delta R similar to+0.08 Angstrom) and a tilting angle of 16 degrees+/-2 degrees. The temperature-dependent distortions show a maximum around T* (similar to 1.6T(c)) and a minimum at T-c (similar to 35 K). The The data show the coexistence of two types of doped charges in different stripes in the superconducting phase.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
