Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-10-25
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages
Scientific paper
We report low-energy inelastic neutron scattering data of the paramagnetic (PM) to hidden-order (HO) phase transition at T0=17.5K in URu2Si2. While confirming previous results for the HO and PM phases, our data reveal a pronounced wavevector dependence of quasielastic scattering across the phase transition. Temperature scans at a small energy transfer of 0.5meV establish an abrupt step-like suppression of the excitations at Q1=(1.44,0,0) below T0, whereas excitations at Q0=(1,0,0), associated with large-moment antiferromagnetism (LMAF) under pressure, are enhanced with a pronounced peak at T0. This is the behavior expected of a "super-vector" order parameter with nearly degenerate components for the HO and LMAF leading to nearly isotropic fluctuations in the combined order-parameter space.
Dunsiger S. R.
Faulhaber Enrico
Huang Yue-Kai
Link Peter
Mydosh John A.
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