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000281911 1001_ $$0P:(DE-HGF)0$$aNiklowitz, P. G.$$b0$$eCorresponding author
000281911 245__ $$aRole of commensurate and incommensurate low-energy excitations in the paramagnetic to hidden-order transition of URu$_{2}$Si$_{2}$
000281911 260__ $$aCollege Park, Md.$$bAPS$$c2015
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000281911 520__ $$aWe report low-energy inelastic neutron scattering data of the paramagnetic (PM) to hidden-order (HO) phase transition at T0=17.5K in URu2Si2. While confirming previous results for the HO and PM phases, our data reveal a pronounced wave-vector dependence of low-energy excitations across the phase transition. To analyze the energy scans we employ a damped harmonic oscillator model containing a fit parameter 1/Γ which is expected to diverge at a second-order phase transition. Counter to expectations the excitations at Q⃗ 1≈(1.4,0,0) show an abrupt steplike suppression of 1/Γ below T0, whereas excitations at Q⃗ 0=(1,0,0), associated with large-moment antiferromagnetism (LMAF) under pressure, show an enhancement and a pronounced peak of 1/Γ at T0. Therefore, at the critical HO temperature T0, LMAF fluctuations become nearly critical as well. This is the behavior expected of a “supervector” order parameter with nearly degenerate components for the HO and LMAF leading to nearly isotropic fluctuations in the combined order-parameter space.
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000281911 7001_ $$0P:(DE-HGF)0$$aDunsiger, S. R.$$b1
000281911 7001_ $$0P:(DE-HGF)0$$aPfleiderer, C.$$b2
000281911 7001_ $$0P:(DE-HGF)0$$aLink, P.$$b3
000281911 7001_ $$0P:(DE-Juel1)156579$$aSchneidewind, A.$$b4$$ufzj
000281911 7001_ $$0P:(DE-HGF)0$$aFaulhaber, E.$$b5
000281911 7001_ $$0P:(DE-HGF)0$$aVojta, M.$$b6
000281911 7001_ $$0P:(DE-HGF)0$$aHuang, Y.-K.$$b7
000281911 7001_ $$0P:(DE-HGF)0$$aMydosh, J. A.$$b8
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