Complex Magnetic Behavior of the Ce sawtooth chains in CeRhSn$_2$
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | Opletal, P. Fikáček, J. Duverger-Nédellec, E. Thamizhavel, A. Hossain, Z. Tarasenko, R. Tkáč, V. Legut, D. Shen, Bin Gegenwart, P. Custers, J. |
| author_facet | Opletal, P. Fikáček, J. Duverger-Nédellec, E. Thamizhavel, A. Hossain, Z. Tarasenko, R. Tkáč, V. Legut, D. Shen, Bin Gegenwart, P. Custers, J. |
| contents | Conflicting reports exist on the ground state of the intermetallic compound CeRhSn$_2$. This can be rooted in the sawtooth-like arrangement of two inequivalent Ce sites in the unit cell, which suggests potential geometric magnetic frustration. To resolve, we conducted a comprehensive study on high-quality single crystals of CeRhSn$_2$ by means of magnetization ($M$), specific heat ($C_p/T$), and resistivity ($ρ$). The system exhibits strong magnetic anisotropy, confirming the $b$-axis as the easy magnetic axis. We establish three successive transitions, an AFM order at $T_{N} = 3.65$K, a first-order FM order at $T_{C} = 1.7$K and final transition, at $T = 1.5$K. The transition temperatures are highly field-directional dependent: in a magnetic field, the lowest transition is immediately suppressed while $\mathbf{H} \parallel b$ rapidly merges $T_{C}$ and $T_{N}$ into a single second-order transition. Conversely, $\mathbf{H}\parallel c$ suppresses the FM order and reduces $T_{N}$. Additional ab initio calculations affirm the FM ground state of CeRhSn$_2$. The observation of an enhancement of the Sommerfeld coefficient ($γ= 76.5$mJ/mol$\cdot$K$^2$) may arise from geometric frustration, but it is most consistently attributed to weak Kondo hybridization as frustration cannot be conclusively established through our data. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_31118 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Complex Magnetic Behavior of the Ce sawtooth chains in CeRhSn$_2$ Opletal, P. Fikáček, J. Duverger-Nédellec, E. Thamizhavel, A. Hossain, Z. Tarasenko, R. Tkáč, V. Legut, D. Shen, Bin Gegenwart, P. Custers, J. Strongly Correlated Electrons Conflicting reports exist on the ground state of the intermetallic compound CeRhSn$_2$. This can be rooted in the sawtooth-like arrangement of two inequivalent Ce sites in the unit cell, which suggests potential geometric magnetic frustration. To resolve, we conducted a comprehensive study on high-quality single crystals of CeRhSn$_2$ by means of magnetization ($M$), specific heat ($C_p/T$), and resistivity ($ρ$). The system exhibits strong magnetic anisotropy, confirming the $b$-axis as the easy magnetic axis. We establish three successive transitions, an AFM order at $T_{N} = 3.65$K, a first-order FM order at $T_{C} = 1.7$K and final transition, at $T = 1.5$K. The transition temperatures are highly field-directional dependent: in a magnetic field, the lowest transition is immediately suppressed while $\mathbf{H} \parallel b$ rapidly merges $T_{C}$ and $T_{N}$ into a single second-order transition. Conversely, $\mathbf{H}\parallel c$ suppresses the FM order and reduces $T_{N}$. Additional ab initio calculations affirm the FM ground state of CeRhSn$_2$. The observation of an enhancement of the Sommerfeld coefficient ($γ= 76.5$mJ/mol$\cdot$K$^2$) may arise from geometric frustration, but it is most consistently attributed to weak Kondo hybridization as frustration cannot be conclusively established through our data. |
| title | Complex Magnetic Behavior of the Ce sawtooth chains in CeRhSn$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2605.31118 |