We report on measurements, by polarized neutron elastic scattering, of the magnetization distribution induced in a single crystal of URu 2Si 2 under a magnetic field applied along the tetragonal c axis. A subtle change in this distribution, revealed by maximum entropy analysis of the data, is found when the temperature is decreased to the range of the hidden order. An analysis in terms of U4 + ionic states reveals that this change is a fingerprint of a freezing of rank 5 multipoles, i.e., dotriacontapoles.
ASJC Scopus subject areas
- Physics and Astronomy(all)