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The results of X-ray and neutron scattering studies of the temperature dependence of the magnetic scattering exhibited by the type I, triple-Q antiferromagnet UO(2) are presented. It is found that a second, longer length scale is induced near the magnetic ordering transition when the near surface volume of the sample is mechanically roughened. The longitudinal and transverse widths of the additional scattering increase continuously with increasing temperature above T(N), similar to that which has been observed near the magnetic ordering transitions of Ho, Tb and NpAs and near the tetragonal to cubic transitions of various perovskites. An unusual feature of the present results for UO(2) involves the apparent shift of the magnetic scattering along the surface normal direction at the (1,1,0) reflection, but not at the 2,1,0) reflection. To our knowledge, this is the first observation of a second length scale near a first order transition.

Additional information

Authors: WATSON G M ET AL, Brookhaven National Laboratory, Department of Physics, Upton (US);GAULIN B D, McMaster University, Department of Physics and Astronomy, Hamilton (CA);LANDER G H ET AL, JRC Karlsruhe (DE);WANG S ETAL, SUNY at Stony Brook, Department of Materials Science and Engineering, New York (US)
Bibliographic Reference: Article: Physical Review B (1995)
Record Number: 199512113 / Last updated on: 1996-01-15
Original language: en
Available languages: en
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