- Author
-
P.G. Niklowitz
S.R. Dunsiger
C. Pfleiderer
P. Link
A. Schneidewind
E. Faulhaber
M. Vojta
Y.K. Huang
J.A. Mydosh - Year
- 2015
- Title
- Role of commensurate and incommensurate low-energy excitations in the paramagnetic to hidden-order transition of URu2Si2
- Journal
- Physical Review B
- Volume | Issue number
- 92 | 11
- Article number
- 115116
- Number of pages
- 6
- Document type
- Article
- Faculty
- Faculty of Science (FNWI)
- Institute
- Van der Waals-Zeeman Institute (WZI)
- Abstract
-
We report low-energy inelastic neutron scattering data of the paramagnetic (PM) to hidden-order (HO) phase transition at T-0 = 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/Gamma which is expected to diverge at a second-order phase transition. Counter to expectations the excitations at (Q) over right arrow (1) approximate to (1.4,0,0) show an abrupt steplike suppression of 1/Gamma below T-0, whereas excitations at (Q) over right arrow (0) = (1,0,0), associated with large-moment antiferromagnetism (LMAF) under pressure, show an enhancement and a pronounced peak of 1/Gamma at T-0. Therefore, at the critical HO temperature T-0, 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.
- URL
- go to publisher's site
- Language
- English
- Permalink
- http://hdl.handle.net/11245/1.496341
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