Abstract
Polarization-dependent X-ray-absorption fine-structure (XAFS) measurements on the local structure of the La2CuO4-based high-T c superconductors La2−x Sr x CuO4, La2−x Ba x CuO4, and La1.6−x Sr x Nd0.4CuO4 find, among others, orientation disorder induced in the Cu–O2 planes by doping Sr, Ba, and alloying Nd atoms, all such atoms residing in La-sites. The orientation disorder is of two types: mostly static-buckling disorder, and dynamic disordering of the tilt angles of the Cu–O6 octahedra correlated in nanoscale regions, with respect to neighboring nanoscale regions. Buckling disorder in the Cu–O2 planes has the greatest detrimental effect on T c and conductivity for such foreign atoms.
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Stern, E.A., Han, SW. & Haskel, D. Dynamic Inhomogeneities in the La2CuO4-Based Superconductors. Journal of Superconductivity 17, 97–102 (2004). https://doi.org/10.1023/B:JOSC.0000011849.77303.e6
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DOI: https://doi.org/10.1023/B:JOSC.0000011849.77303.e6