The dual nature of magnetism in a uranium heavy fermion system

Lee, Jooseop; Matsuda, Masaaki; Mydosh, John A.; Zaliznyak, Igor; Kolesnikov, Alexander I.; Sullow, Stefan; Ruff, Jacob P. C.; Granroth, Garrett E.

doi:10.1103/PhysRevLett.121.057201

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

Journal Article · 30 July 2018 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.121.057201 · OSTI ID:1460695

Lee, Jooseop ^[1]; Matsuda, Masaaki ^[2]; Mydosh, John A. ^[3]; Zaliznyak, Igor ^[4]; Kolesnikov, Alexander I. ^[2]; Sullow, Stefan ^[5]; Ruff, Jacob P. C. ^[6]; Granroth, Garrett E. ^[2]

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)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Leiden Univ. (Netherlands). Kamerlingh Onnes Lab. Lorentz Inst.
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Braunschweig Univ. of Technology (Germany)
Cornell Univ., Ithaca, NY (United States). Cornell High Energy Synchrotron Source (CHESS)

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.

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Research Organization:: 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 Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); ORNL Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF) (United States); National Inst. of Health (NIH) (United States)

Grant/Contract Number:: SC0012704

OSTI ID:: 1460695

Report Number(s):: BNL--207824-2018-JAAM

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 121; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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