期刊
SCIENCE
卷 352, 期 6290, 页码 1206-1210出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaf0981
关键词
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资金
- Office of Basic Energy Sciences (BES), Division of Materials Sciences and Engineering, U.S. Department of Energy (DOE) [DE-SC00112704]
- NSF [DMR-131008, DMR-1508249]
- Laboratory Directed Research and Development Program of Oak Ridge National Laboratory (ORNL)
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. DOE
- Netherlands Organization for Scientific Research (NWO)
- Foundation for Fundamental Research on Matter (FOM) of the Netherlands
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1660406] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1310008] Funding Source: National Science Foundation
Exotic quantum states and fractionalized magnetic excitations, such as spinons in one-dimensional chains, are generally expected to occur in 3d transition metal systems with spin 1/2. Our neutron-scattering experiments on the 4f-electron metal Yb2Pt2Pb overturn this conventional wisdom. We observe broad magnetic continuum dispersing in only one direction, which indicates that the underlying elementary excitations are spinons carrying fractional spin-1/2. These spinons are the emergent quantum dynamics of the anisotropic, orbital-dominated Yb moments. Owing to their unusual origin, only longitudinal spin fluctuations are measurable, whereas the transverse excitations such as spin waves are virtually invisible to magnetic neutron scattering. The proliferation of these orbital spinons strips the electrons of their orbital identity, resulting in charge-orbital separation.
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