Gapped Excitations in the High-Pressure Antiferromagnetic Phase of URu${}_2$Si${}_2$

Abstract

We report a neutron scattering study of the magnetic excitation spectrum in each of the three temperature and pressure driven phases of URu${}_2$Si${}_2$. We find qualitatively similar excitations throughout the (H0L) scattering plane in the hidden order and large moment phases, with no changes in the $\hslash \omega$-widths of the excitations at the $\Sigma$ = (1.407,0,0) and $Z$ = (1,0,0) points, within our experimental resolution. There is, however, an increase in the gap at the $\Sigma$ point from 4.2(2) meV to 5.5(3) meV, consistent with other indicators of enhanced antiferromagnetism under pressure.

5 pages, 3 figures, 1 table

References in corpus (4)

• Gapped itinerant spin excitations account for missing entropy in the hidden order state of URu${}_2$Si${}_2$
• Antiferromagnetic critical pressure in URu2Si2 under hydrostatic conditions
• Symmetry and correlations underlying Hidden Order in URu2Si2
• Neutron scattering studies on URu2Si2

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