Anisotropic phonon softening in URu$_{2}$Si$_{2}$
ORAL
Abstract
We studied the low-energy phonons of URu$_{2}$Si$_{2}$ via inelastic neutron scattering. At the wave-vectors associated with magnetic excitations, the phonons show surprisingly little modification. However, we find important temperature and direction dependence of the phonons in the basal plane. Possible ramifications for the symmetry of the hidden order will be discussed.
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