X-ray resonant scattering study of the quadrupolar order in UPd3
Quadrupolar ordering in a 5f electron system has been observed directly for the first time, using x-ray scattering techniques. In UPd3 at low temperatures satellite peaks appear at (1, 0, l) (orthorhombic notation) with I odd and even. Both sets of peaks show a resonant enhancement of the scattering at the M-IV edge of U. At resonance, the dominant scattering of the 1 odd peaks occurs in the unrotated polarization channel, whereas for I even a significant rotated component is found. These results are discussed in terms of possible structures of the antiferroquadrupolar phases.
Riso Natl Lab, Dept Mat Res, DK-4000 Roskilde, Denmark. Univ Coll London, Dept Phys & Astron, London WC1E 6BT, England. Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England. European Synchrotron Radiat Facil, F-38043 Grenoble, France. McMorrow, DF, Riso Natl Lab, Dept Mat Res, DK-4000 Roskilde, Denmark.
Record created on 2007-01-24, modified on 2016-08-08