Abstract
In single crystal , , c-axis interstitial oxygen ordering (staging) in the oxygen-rich phase of the phase-separated sample was observed through satellite peaks in the neutron scattering at which first appear at 250 K. A superconducting was achieved by prolonged annealing at 200 K of a staged crystal whose was subsequently enhanced by during a 7 h cooling from 215 to 190 K. This annealing below 215 K initiates a splitting of the staging satellites along the direction which signifies a one-dimensional modulation of the in-plane order.
- Received 25 September 1995
DOI:https://doi.org/10.1103/PhysRevLett.76.2997
©1996 American Physical Society