Journal
NEW JOURNAL OF PHYSICS
Volume 15, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/15/5/053031
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Funding
- US DOE [DE FG02-04ER46105]
- LANL Directed Research and Development program
- Alexander von Humboldt foundation
- US DOE, OBES, Division of Materials Sciences and Engineering
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We have carried out a careful magnetic neutron scattering study of the heavy fermion compound URu2Si2 to probe the possible existence of a small magnetic moment parallel to tetragonal basal plane in the 'hidden-order' phase. This small in-plane component of the magnetic moment on the uranium sites S-parallel to has been postulated by two recent models (rank-5 superspin/hastatic order) aiming to explain the hidden-order phase, in addition to the well-known out-of- plane component S-perpendicular to approximate to 0.01-0.04 mu(B)/U. In order to separate S-parallel to and S-perpendicular to, we take advantage of the condition that for magnetic neutron scattering only the components of the magnetic structure that are perpendicular to the scattering vector Q contribute to the magnetic scattering. We find no evidence for an in-plane magnetic moment S-parallel to. Based on the statistics of our measurement, we establish that the upper experimental limit for the size of any possible in-plane component is S-parallel to(max) <= 1 x 10(-3) mu(B)/U.
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