Neutron-scattering measurements have been performed to search for possible elastic incommensurate magnetic peaks in superconducting (Formula presented) with (Formula presented) 0.12, and 0.15. The most dramatic effects are found for (Formula presented) in this case, the peak intensity first appears at the onset of superconductivity (Formula presented) The resolution-limited peak width indicates that the static magnetic correlation length exceeds 200 Å isotropically in the (Formula presented) planes. Weak elastic peaks are also observed at low temperatures for (Formula presented) while for (Formula presented) any incommensurate elastic scattering is below the limit of detectability. Elastic peaks are observed in Zn-substituted nonsuperconducting (Formula presented) 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 (Formula presented) sample.
|Original language||English (US)|
|Number of pages||7|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 1999|