T E Mason et al 1995 J. Phys.: Condens. Matter 7 5089 doi:10.1088/0953-8984/7/26/014
T E Mason, W J L Buyers, T Petersen, A A Menovsky and J D Garrett
Show affiliationsWe have searched for the hidden multispin order parameters that have been proposed to explain the weak ordered moment observed in the heavy-fermion superconductor URu2Si2. Since the exotic spin order is predicted to cause broken-symmetry Bragg peaks that develop rapidly with applied magnetic field, we have measured their strength in fields up to 8 T, for which a large easily observable moment is predicted. The Bragg neutron scattering is found to decrease rather than increase when a field is applied along the easy tetragonal c-axis, while there is no change for a field at right angles. The results rule out the proposed symmetric multispin order parameters. The zero-field transition is found to exhibit critical softening of the spin gap and a cusp in the susceptibility at TN, as expected for the ordering of magnetic dipoles.
74.70.Tx Heavy-fermion superconductors
61.05.fg Neutron scattering (including small-angle scattering)
Issue 26 (26 June 1995)
T E Mason et al 1995 J. Phys.: Condens. Matter 7 5089
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