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. 2012 Aug 10;109(6):067202.
doi: 10.1103/PhysRevLett.109.067202. Epub 2012 Aug 7.

Hidden order in URu2Si2 unveiled

E Ressouche  1 , R Ballou, F Bourdarot, D Aoki, V Simonet, M T Fernandez-Diaz, A Stunault, J Flouquet
Affiliations

Hidden order in URu2Si2 unveiled

E Ressouche et al. Phys Rev Lett. .

Abstract

We report on measurements, by polarized neutron elastic scattering, of the magnetization distribution induced in a single crystal of URu2Si2 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 U(4+) ionic states reveals that this change is a fingerprint of a freezing of rank 5 multipoles, i.e., dotriacontapoles.

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