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Published on: June 28, 2016
X-ray resonant scattering study of the quadrupolar order in UPd3
D F McMorrow1, K A McEwen, U Steigenberger
1Materials Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark.
Abstract:
Quadrupolar ordering in a 5f electron system has been observed directly for the first time, using x-ray scattering techniques. In UPd (3) at low temperatures satellite peaks appear at (1,0,l) (orthorhombic notation) with l 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 l odd peaks occurs in the unrotated polarization channel, whereas for l even a significant rotated component is found. These results are discussed in terms of possible structures of the antiferroquadrupolar phases.
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