Anomalous temperature-dependent magnetization in the nearly collinear antiferromagnet Y2 Co3
Date
2025-01-26
Authors
Shi, Yunshu
Cao, Huibo
Wu, Hung-Cheng
Harrison, Neil
Parker, David S.
Bhowmick, Tushar
McNamee, Tessa
Safari, Fatemeh
Bud’ko, Sergey L.
Fettinger, James C.
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Abstract
Y2Co3 is a newly discovered antiferromagnetic (AFM) compound with distorted kagome layers. Previous investigations via bulk magnetization measurements suggested a complex noncollinear magnetic behavior, with magnetic moments primarily anti-aligned along the b axis and some canting towards the ac plane. In this study, we report the magnetic structure of Y2Co3 to be an A-type AFM structure with ferromagnetic (FM) interactions within the distorted kagome plane and an interplane antiferromagnetic interaction, as determined by single-crystal neutron diffraction. The magnetic moments align along the b axis, with minimal canting towards the c axis, at odds with the previous interpretation of bulk magnetization measurements. The magnetic moments on the two distinct Co sites are [0, -0.68(3), 0] μB and [0, 1.25(4), 0.07(1)] μB. We attribute the previously reported "noncollinear" behavior to the considerable temperature dependence of itinerant AFM exchange interactions, induced by thermal contraction along the b axis. Additionally, our examination of lattice constants through pressure studies reveals compensating effects on FM and AFM interactions, resulting in negligible pressure dependence of TN.
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This is a preprint from Shi, Yunshu, Huibo Cao, Hung-Cheng Wu, Li Yin, Neil Harrison, David S. Parker, Tushar Bhowmick et al. "Anomalous temperature-dependent magnetization in the nearly collinear antiferromagnet Y $ _2 $ Co $ _3$." arXiv preprint arXiv:2501.15706 (2025). doi: https://doi.org/10.48550/arXiv.2501.15706.
Published as Shi, Yunshu, Huibo Cao, Hung-Cheng Wu, Li Yin, Neil Harrison, David S. Parker, Tushar Bhowmick et al. "Anomalous temperature-dependent magnetization in the nearly collinear antiferromagnet Y 2 Co 3." Physical Review B 110, no. 23 (2024): 235159. doi: https://doi.org/10.1103/PhysRevB.110.235159.
Published as Shi, Yunshu, Huibo Cao, Hung-Cheng Wu, Li Yin, Neil Harrison, David S. Parker, Tushar Bhowmick et al. "Anomalous temperature-dependent magnetization in the nearly collinear antiferromagnet Y 2 Co 3." Physical Review B 110, no. 23 (2024): 235159. doi: https://doi.org/10.1103/PhysRevB.110.235159.
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This preprint is licensed as CC BY.