DOE OSTI Ā· 3020881
Emergent quasi-one-dimensional antiferromagnetism in the distorted kagome magnet CePtPb
Abstract
CePtPb hosts a distorted kagome lattice of Ce 3+ ions, providing a clean platform to investigate how reduced local symmetry and strong spin-orbit coupling reshape frustrated magnetism. Magnetization, specific heat, and magnetocaloric effect measurements, combined with a symmetry analysis of the single-ion anisotropy, demonstrate that the local šā¢2ā¢š site symmetry selects a nearly Ising-like Kramers doublet with easy axes lying within the šā¢š plane. This results in three distinct in-plane Ising directions and an overall easy-plane anisotropy. The low-energy magnetic response is well captured by a three-sublattice Ising model, which quantitatively reproduces the saturation magnetization for arbitrary in-plane field orientations, including $[110]$ and $[1\bar{ā¢1}ā¢0]$, as well as the ratio of the field-induced critical fields. For šµā„$[110]$, the phase diagram exhibits two quantum critical points at šµ cā¢1 = 0.25T and šµ cā¢2 = 0.55T, arising from the sequential polarization of the three Ising sublattices. In conclusion, these results reveal that the system develops quasi-one-dimensional spin chains along the š axis, emerging from the nominally three-dimensional crystal structure composed of stacked kagome layers, and illustrate how reduced local symmetry can drive effective dimensional reduction in rare-earth Ising magnets.
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Li, Fangli [Southern University of Science and Technology (SUSTech), Shenzhen (China)] (ORCID:0009000879333081), Liu, Pengfei [Southern University of Science and Technology (SUSTech), Shenzhen (China)] (ORCID:0000000307982214), Fu, Ying [Southern University of Science and Technology (SUSTech), Shenzhen (China); Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong), Shenzhen (China)], Xu, Lei [Zhejiang University, Hangzhou (China)], Ge, Han [Southern University of Science and Technology (SUSTech), Shenzhen (China)] (ORCID:0000000279810019), Yang, Jiong [Southern University of Science and Technology (SUSTech), Shenzhen (China); Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong), Shenzhen (China)], Bu, Huanpeng [Southern University of Science and Technology (SUSTech), Shenzhen (China)], Hu, Biaoyan [Southern University of Science and Technology (SUSTech), Shenzhen (China); Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong), Shenzhen (China)] (ORCID:0000000281244212), Zhao, Nan [Southern University of Science and Technology (SUSTech), Shenzhen (China); Spallation Neutron Source Science Center, Dongguan (China); Chinese Academy of Sciences (CAS), Beijing (China). Institute of High Energy Physics (IHEP)], Li, Tiantian [City University of Hong Kong, Kowloon (Hong Kong)] (ORCID:0009000034231518), Yuan, Jiayue [Southern University of Science and Technology (SUSTech), Shenzhen (China)], Zhang, Chen [Southern University of Science and Technology (SUSTech), Shenzhen (China)] (ORCID:0009000953765705), Liu, Junzhe [Southern University of Science and Technology (SUSTech), Shenzhen (China)], Ouyang, Zhongwen [Huazhong University of Science & Technology, Wuhan (China)], Miao, Ping [Spallation Neutron Source Science Center, Dongguan (China); Chinese Academy of Sciences (CAS), Beijing (China). Institute of High Energy Physics (IHEP)], Sheng, Jieming [Great Bay University (GBU), Dongguan (China). Great Bay Institute for Advanced Study], Podlesnyak, Andrey A. [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000193666319), Wu, Liusuo [Southern University of Science and Technology (SUSTech), Shenzhen (China); Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong), Shenzhen (China)]. 2026-02-20. Emergent quasi-one-dimensional antiferromagnetism in the distorted kagome magnet CePtPb. https://doi.org/10.1103/hjkq-j6zb
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