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Title: Gapped excitations in the high-pressure antiferromagnetic phase of URu 2 Si 2

Here, we report a neutron scattering study of the magnetic excitation spectrum in each of the three temperature and pressure driven phases of URu 2Si 2. We also found 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 and an increase in the first moment of both excitations. At 8 meV where the Q-dependence of magnetic scattering in the hidden order phase is extended in Q-space, the excitations in the large moment phase are sharper. Furthermore, the expanded Q-hbar-omega coverage of this study suggest more complete nesting within the antiferromagnetic phase, an important property for future theoretical predictions of a hidden order parameter.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [5] ;  [7] ;  [8] ;  [9] ;  [4] ;  [9] ;  [3] ;  [10]
  1. McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy
  2. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  3. Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter and Dept. of Physics and Astronomy
  4. National Research Council, Chalk River, ON (Canada)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  6. (United States). Dept. of Materials Science and Engineering
  7. McMaster Univ., Hamilton, ON (Canada). Brockhouse Inst. for Materials Science
  8. McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy and Brockhouse Inst. for Materials Science
  9. (Canada)
  10. (NIST), Gaithersburg, MD (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; FG02-08ER46544
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 19; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1361303
Alternate Identifier(s):
OSTI ID: 1360996