Intercalation and Staging Behavior in Super-Oxygenated $La_2CuO_{4 + δ}$

Details Intercalation and Staging Behavior in Super-Oxygenated $La_2CuO_{4 + δ}$ Intercalation and Staging Behavior in Super-Oxygenated $La_2CuO_{4 + δ}$

1995-07-27

arxiv.org/abs/cond-mat/9507124v1

Z. Phys. B 100, 535-545 (1996)

Physics

Condensed Matter

23 pages, latex, 6 figures (not including Figures 2 & 7 and Table 1 which were not submitted but are available upon request to

Scientific paper

10.1007/s002570050158

A high temperature electrochemical oxidation process has been used to produce large single crystals of $La_2CuO_{4 + \delta}$ suitable for neutron scattering experiments. Below room temperature the oxygen-rich phases have structural superlattice scattering peaks which indicate new periodicities ranging from 2 to 6.6 layers perpendicular to the copper oxide planes. A model structure originally proposed for $La_2NiO_{4 + \delta}$ can account for the superlattice peaks as a result of anti-phase domain boundaries between different tilt directions of the CuO$_6$ octahedra. Within this model, the changes in CuO$_6$ tilt directions are induced by segregated layers of interstitial oxygen which order in a manner similar to intercalants in graphite. This structural model thus clarifies previous work and establishes $La_2CuO_{4 + \delta}$ as a unique lamellar superconducting system with annealed disorder.

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