Gapped excitations in the high-pressure antiferromagnetic phase of URu2Si2 Academic Article uri icon

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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 $\hbar\omega$-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.

authors

  • Williams, TJ
  • Barath, H
  • Yamani, Z
  • Rodriguez-Riviera, JA
  • Leão, JB
  • Garrett, JD
  • Luke, Graeme
  • Buyers, WJL
  • Broholm, C

publication date

  • May 31, 2017