Abstract
Neutron-scattering measurements have been performed to search for possible elastic incommensurate magnetic peaks in superconducting with 0.12, and 0.15. The most dramatic effects are found for in this case, the peak intensity first appears at the onset of superconductivity The resolution-limited peak width indicates that the static magnetic correlation length exceeds 200 Å isotropically in the planes. Weak elastic peaks are also observed at low temperatures for while for any incommensurate elastic scattering is below the limit of detectability. Elastic peaks are observed in Zn-substituted nonsuperconducting However, in this case, the Zn substitution degrades the magnetic order; the peak appears at lower temperature (17 K) and the correlation length is shorter (80 Å) than that in the Zn-free sample.
- Received 20 July 1998
DOI:https://doi.org/10.1103/PhysRevB.59.6517
©1999 American Physical Society