Magnetism of kagome metals $\left(\text{Fe}_{1-x} \text{Co}_{x}\right) \text{Sn}$ studied by $μ$SR
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arXiv
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| Natura: | Preprint |
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2025
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| author | Cai, Yipeng Yoon, Sungwon Sheng, Qi Zhao, Guoqiang Seewald, Eric Francis Ghosh, Sanat Ingham, Julian Pasupathy, Abhay Narayan Queiroz, Raquel Lei, Hechang Xie, Yaofeng Dai, Pengcheng Ito, Takashi Ke, Ruyi Cava, Robert J. Sharma, Sudarshan Pula, Mathew Luke, Graeme M. Kojima, Kenji M. Uemura, Yasutomo J. |
| author_facet | Cai, Yipeng Yoon, Sungwon Sheng, Qi Zhao, Guoqiang Seewald, Eric Francis Ghosh, Sanat Ingham, Julian Pasupathy, Abhay Narayan Queiroz, Raquel Lei, Hechang Xie, Yaofeng Dai, Pengcheng Ito, Takashi Ke, Ruyi Cava, Robert J. Sharma, Sudarshan Pula, Mathew Luke, Graeme M. Kojima, Kenji M. Uemura, Yasutomo J. |
| contents | We study the magnetic properties of the metallic kagome system $\left(\mathrm{Fe}_{1-x} \mathrm{Co}_{x}\right) \mathrm{Sn}$ by a combination of Muon Spin Relaxation ($μ\mathrm{SR}$), magnetic susceptibility and Scanning Tunneling Microscopy (STM) measurements, in single crystal specimens with Co concentrations $\mathrm{x}=0,0.11,0.8$. In the undoped antiferromagnetic compound FeSn, we find possible signatures for a previously unidentified phase that sets in at $T^*\sim 50$ K, well beneath the Neel temperature $T_N \sim 376$ K, as indicated by a peak in the relaxation rate $1/T_1$ observed in zero field (ZF) and longitudinal field (LF) $μ\mathrm{SR}$ measurements, with a corresponding anomaly in the ac and dc-susceptibility, and an increase in the static width $1/T_2$ in ZF measurements. No signatures of spatial symmetry breaking are found in STM down to $7$ K. In $\mathrm{Fe}_{0.2} \mathrm{Co}_{0.8} \mathrm{Sn}$, we find canonical spin glass behavior with freezing temperature $T_{g} \sim 3.5 \mathrm{~K}$; the ZF and LF time spectra exhibit results similar to those observed in dilute alloy spin glasses CuMn and AuFe, with a critical behavior of $1 / T_{1}$ at $T_{g}$ and $1 / \mathrm{T}_{1}\rightarrow 0$ as $T \rightarrow 0$. The absence of spin dynamics at low temperatures makes a clear contrast to the spin dynamics observed by $μ\mathrm{SR}$ in many geometrically frustrated spin systems on insulating kagome, pyrochlore, and triangular lattices. The spin glass behavior of CoSn doped with dilute Fe moments is shown to originate primarily from the randomness of doped Fe moments rather than due to geometrical frustration of the underlying lattice. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_22249 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Magnetism of kagome metals $\left(\text{Fe}_{1-x} \text{Co}_{x}\right) \text{Sn}$ studied by $μ$SR Cai, Yipeng Yoon, Sungwon Sheng, Qi Zhao, Guoqiang Seewald, Eric Francis Ghosh, Sanat Ingham, Julian Pasupathy, Abhay Narayan Queiroz, Raquel Lei, Hechang Xie, Yaofeng Dai, Pengcheng Ito, Takashi Ke, Ruyi Cava, Robert J. Sharma, Sudarshan Pula, Mathew Luke, Graeme M. Kojima, Kenji M. Uemura, Yasutomo J. Strongly Correlated Electrons We study the magnetic properties of the metallic kagome system $\left(\mathrm{Fe}_{1-x} \mathrm{Co}_{x}\right) \mathrm{Sn}$ by a combination of Muon Spin Relaxation ($μ\mathrm{SR}$), magnetic susceptibility and Scanning Tunneling Microscopy (STM) measurements, in single crystal specimens with Co concentrations $\mathrm{x}=0,0.11,0.8$. In the undoped antiferromagnetic compound FeSn, we find possible signatures for a previously unidentified phase that sets in at $T^*\sim 50$ K, well beneath the Neel temperature $T_N \sim 376$ K, as indicated by a peak in the relaxation rate $1/T_1$ observed in zero field (ZF) and longitudinal field (LF) $μ\mathrm{SR}$ measurements, with a corresponding anomaly in the ac and dc-susceptibility, and an increase in the static width $1/T_2$ in ZF measurements. No signatures of spatial symmetry breaking are found in STM down to $7$ K. In $\mathrm{Fe}_{0.2} \mathrm{Co}_{0.8} \mathrm{Sn}$, we find canonical spin glass behavior with freezing temperature $T_{g} \sim 3.5 \mathrm{~K}$; the ZF and LF time spectra exhibit results similar to those observed in dilute alloy spin glasses CuMn and AuFe, with a critical behavior of $1 / T_{1}$ at $T_{g}$ and $1 / \mathrm{T}_{1}\rightarrow 0$ as $T \rightarrow 0$. The absence of spin dynamics at low temperatures makes a clear contrast to the spin dynamics observed by $μ\mathrm{SR}$ in many geometrically frustrated spin systems on insulating kagome, pyrochlore, and triangular lattices. The spin glass behavior of CoSn doped with dilute Fe moments is shown to originate primarily from the randomness of doped Fe moments rather than due to geometrical frustration of the underlying lattice. |
| title | Magnetism of kagome metals $\left(\text{Fe}_{1-x} \text{Co}_{x}\right) \text{Sn}$ studied by $μ$SR |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.22249 |