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Title: The dual nature of magnetism in a uranium heavy fermion system

The duality between localized and itinerant nature of magnetism in 5f electron systems has been a longstanding puzzle. In this paper, we report inelastic neutron scattering measurements, which reveal both local and itinerant aspects of magnetism in a single crystalline system of UPt 2Si 2. In the antiferromagnetic state, we observe broad continuum of diffuse magnetic scattering with a resonance-like gap of ≈7 meV, and surprising absence of coherent spin-waves, suggestive of itinerant magnetism. While the gap closes above the Neel temperature, strong dynamic spin correlations persist to high temperature. Nevertheless, the size and temperature dependence of the total magnetic spectral weight can be well described by local moment with J = 4. Furthermore, polarized neutron measurements reveal that the magnetic fluctuations are mostly transverse, with little or none of the longitudinal component expected for itinerant moments. Finally, these results suggest that a dual description of local and itinerant magnetism is required to understand UPt 2Si 2, and by extension, other 5f systems in general.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [5] ;  [6] ;  [2]
  1. Cornell Univ., Ithaca, NY (United States). Cornell High Energy Synchrotron Source (CHESS); Inst. for Basic Science, Pohang (Korea, Republic of). Center for Artificial Low Dimensional Electronic Systems (CALDES)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  3. Leiden Univ. (Netherlands). Kamerlingh Onnes Lab. Lorentz Inst.
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  5. Braunschweig Univ. of Technology (Germany)
  6. Cornell Univ., Ithaca, NY (United States). Cornell High Energy Synchrotron Source (CHESS)
Publication Date:
Report Number(s):
BNL-207824-2018-JAAM
Journal ID: ISSN 0031-9007
Grant/Contract Number:
SC0012704; DMR-1332208; AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 5; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Cornell Univ., Ithaca, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); ORNL Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); National Inst. of Health (NIH) (United States)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1460695
Alternate Identifier(s):
OSTI ID: 1462161; OSTI ID: 1474559

Lee, Jooseop, Matsuda, Masaaki, Mydosh, John A., Zaliznyak, Igor, Kolesnikov, Alexander I., Sullow, Stefan, Ruff, Jacob P. C., and Granroth, Garrett E.. The dual nature of magnetism in a uranium heavy fermion system. United States: N. p., Web. doi:10.1103/PhysRevLett.121.057201.
Lee, Jooseop, Matsuda, Masaaki, Mydosh, John A., Zaliznyak, Igor, Kolesnikov, Alexander I., Sullow, Stefan, Ruff, Jacob P. C., & Granroth, Garrett E.. The dual nature of magnetism in a uranium heavy fermion system. United States. doi:10.1103/PhysRevLett.121.057201.
Lee, Jooseop, Matsuda, Masaaki, Mydosh, John A., Zaliznyak, Igor, Kolesnikov, Alexander I., Sullow, Stefan, Ruff, Jacob P. C., and Granroth, Garrett E.. 2018. "The dual nature of magnetism in a uranium heavy fermion system". United States. doi:10.1103/PhysRevLett.121.057201.
@article{osti_1460695,
title = {The dual nature of magnetism in a uranium heavy fermion system},
author = {Lee, Jooseop and Matsuda, Masaaki and Mydosh, John A. and Zaliznyak, Igor and Kolesnikov, Alexander I. and Sullow, Stefan and Ruff, Jacob P. C. and Granroth, Garrett E.},
abstractNote = {The duality between localized and itinerant nature of magnetism in 5f electron systems has been a longstanding puzzle. In this paper, we report inelastic neutron scattering measurements, which reveal both local and itinerant aspects of magnetism in a single crystalline system of UPt2Si2. In the antiferromagnetic state, we observe broad continuum of diffuse magnetic scattering with a resonance-like gap of ≈7 meV, and surprising absence of coherent spin-waves, suggestive of itinerant magnetism. While the gap closes above the Neel temperature, strong dynamic spin correlations persist to high temperature. Nevertheless, the size and temperature dependence of the total magnetic spectral weight can be well described by local moment with J = 4. Furthermore, polarized neutron measurements reveal that the magnetic fluctuations are mostly transverse, with little or none of the longitudinal component expected for itinerant moments. Finally, these results suggest that a dual description of local and itinerant magnetism is required to understand UPt2Si2, and by extension, other 5f systems in general.},
doi = {10.1103/PhysRevLett.121.057201},
journal = {Physical Review Letters},
number = 5,
volume = 121,
place = {United States},
year = {2018},
month = {7}
}