Polarized neutron on URu2Si2

F. Bourdarot, E. Ressouche, R. Ballou, S. Raymond, D. Aoki, N. Martin, L. P. Regnault, V. Simonet, M. T. Fernandez-Diaz, A. Stunault, V. Taufour, J. Flouquet

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


Polarized neutron scattering has shed a new light on URu2Si 2. This compound studied for almost thirty years presents two transitions: a superconducting state below 1.2K (Tsc) and a well-defined bulk transition at 17.8K (T0). In spite of intensive research, no local probe has defined the order parameter associated with this transition (the famous Hidden Order (HO)). Neutron Larmor diffraction measurements combined with uniaxial stress experiments have shown that the relevant parameter that governs the magnetic properties is the a-lattice parameter. Induced magnetization distribution measured by elastic polarized neutron scattering shows a subtle change when entering the HO state that suggests a freezing of rank 5 multipoles (i.e. dotriacontapole). Polarized inelastic neutron measurements have shown the existence of two well defined excitations on the top of a broad continuum. However only the AF excitation vanishes at T0 and as well as when URu2Si2 switches between HO to AF state under pressure. These excitations seem to correspond also to transitions between singlet levels.

Original languageEnglish
Pages (from-to)4-9
Number of pages6
JournalPhysics Procedia
Publication statusPublished - 2013
Event9th International Workshop on Polarised Neutrons in Condensed Matter Investigations, PNCMI 2012 - Paris, France
Duration: 2012 Jul 22012 Jul 5


  • Elastic and inelastic neutron scattering
  • Heavy fermions superconductors


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