UPd3 is known to exhibit four antiferroquadrupolar ordered phases at low temperatures. We report measurements of the magnetisation and magnetostriction of single crystal UPd3, along the principal symmetry directions, in fields up to 33 T. These results have been combined with recent inelastic neutron and x-ray resonant scattering measurements to construct a mean field model of UPd3 including up to fourth nearest neighbour interactions. In particular we find that anisotropic quadrupolar interactions must be included in order to explain the low temperature structures derived from the scattering data.
@article{arxiv.1403.4785,
title = {A Mean Field Model for the Quadrupolar Phases of UPd$_3$},
author = {Manh Duc Le and Keith A. McEwen and Martin Rotter and Mathias Doerr and Alexander Barcza and Je-Geun Park and James Brooks and Eric Jobiliong and David Fort},
journal= {arXiv preprint arXiv:1403.4785},
year = {2014}
}