期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-04914-1
关键词
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资金
- Ministry of Science and Technology of China [2016YFA0300500]
- NSF China [11774223]
- JSPS [JP16H02206]
- ORAU's Ralph E. Powe Junior Faculty Enhancement Award
- Los Alamos National Laboratory Directed Research and Development program
- Lincoln Chair of Excellence in Physics
- State of Florida
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. DOE
- [NSF-DMR-1750186]
- [NSF-DMR-1350002]
- [NSF-DMR-1157490]
Magnetization plateaus in quantum magnets-where bosonic quasiparticles crystallize into emergent spin superlattices-are spectacular yet simple examples of collective quantum phenomena escaping classical description. While magnetization plateaus have been observed in a number of spin-1/2 antiferromagnets, the description of their magnetic excitations remains an open theoretical and experimental challenge. Here, we investigate the dynamical properties of the triangular-lattice spin-1/2 antiferromagnet Ba3CoSb2O9 in its one-third magnetization plateau phase using a combination of nonlinear spin-wave theory and neutron scattering measurements. The agreement between our theoretical treatment and the experimental data demonstrates that magnons behave semiclassically in the plateau in spite of the purely quantum origin of the underlying magnetic structure. This allows for a quantitative determination of Ba3CoSb2O9 exchange parameters. We discuss the implication of our results to the deviations from semiclassical behavior observed in zero-field spin dynamics of the same material and conclude they must have an intrinsic origin.
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