Nanostructure in the La<sub>2</sub>CuO<sub>4</sub>-based superconductors

Edward A. Stern; Daniel Haskel

doi:10.1117/12.455492

7 November 2002 Nanostructure in the La₂CuO₄-based superconductors

Edward A. Stern; Daniel Haskel;

Author Affiliations +

Proceedings Volume 4811, Superconducting and Related Oxides: Physics and Nanoengineering V; (2002) https://doi.org/10.1117/12.455492
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

Orientational dependent x-ray absorption fine structure (XAFS) measurements on the local structure of the La₂CuO₄ based high T_c superconductors La_2-xSr_xCuO₄, La_2-xBa_xCuO₄, La_1.6-xSr_xNd_0.4CuO₄, La_1.85Sr_0.15Cu_1-yNi_yO₄, find both displacement and orientational disorder induced by doping (Sr,Ba) and alloying (Nd,Ni) atoms. The displacement disorder is in the first few neighboring atoms to the perturbing atom while the orientational disorder is of nanometer-sized regions which have disordering of the tilt angles of their CuO₆ octahedra with respect to neighboring regions. This disorder affects both the normal and superconducting properties of the materials. It is found that disorder induced in the Cu-O₂ planes has the greatest detrimental effect on T_c and conductivity.

Citation Download Citation

Edward A. Stern, Daniel Haskel, "Nanostructure in the La₂CuO₄-based superconductors", Proc. SPIE 4811, Superconducting and Related Oxides: Physics and Nanoengineering V, (7 November 2002); doi: 10.1117/12.455492; https://doi.org/10.1117/12.455492

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