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A careful investigation of the resonant X-ray magnetic scattering response in uranium monophosphide reveals the crucial role played by magnetisation density correlations in the discontinuous paramagnetic to antiferromagnetic phase transition in this material. The magnetisation density correlations, which are measured on the short time scale typical of the resonant X-ray scattering technique, appear highly anisotropic in their inferred spatial distribution. Such correlated regions exist in the near surface regime probed by the low energy X-ray beam (3.278 keV) and exhibit strongly temperature dependent behaviour at and above the bulk phase transition. For specular reflections this leads to well defined two length scale diffraction profiles in the vicinity of the phase transition and, when taken with the off-specular data, to a phenomenological model which suggests that the extended length scale of near surface antiferromagnetism may arise from a localized surface distortion. This type of model may be more generally useful both in the two length scale problem and in other systems where defects or fluctuations may, in a similar manner, drive pseudo-long range order.

Additional information

Authors: STUNAULT A, European Synchrotron Radiation Facility, Grenoble (FR);VETTIER C, European Synchrotron Radiation Facility, Grenoble (FR);BERNHOEFT N, European Synchrotron Radiation Facility, Grenoble (FR);LANGRIDGE S, JRC Karlsruhe (DE);GIBBS D, Brookhaven National Laboratory, Department of Physics, New York (US)
Bibliographic Reference: Article: Phys Review Condensed Matter
Record Number: 199611156 / Last updated on: 1996-10-28
Original language: en
Available languages: en
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