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원자제어 저차원 전자계 연구단
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Dual Nature of Magnetism in a Uranium Heavy-Fermion System

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Title
Dual Nature of Magnetism in a Uranium Heavy-Fermion System
Author(s)
Jooseop Lee; Masaaki Matsuda; John A.Mydosh; Igor Zaliznyak; Alexander I. Kolesnikov; Stefan Sullow; Jacob P.C. Ruff; Garrett E.Granroth
Publication Date
2018-07
Journal
PHYSICAL REVIEW LETTERS, v.121, no.5, pp.057201 -
Publisher
AMER PHYSICAL SOC
Abstract
The duality between the localized and itinerant nature of magnetism in 5f-electron systems has been a long-standing puzzle. Here, 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 a broad continuum of diffuse magnetic scattering with a resonancelike gap of ≈7 meV and the surprising absence of coherent spin waves, suggestive of itinerant magnetism. While the gap closes above the N´eel temperature, strong dynamic spin correlations persist to a high temperature. Nevertheless, the size and temperature dependence of the total magnetic spectral weight can be well described by a local moment with J ¼ 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. 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. © 2018 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/5262
ISSN
0031-9007
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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