Structural Phase Transition in CeMnSi under Pressure and Comparative Structural Properties of $R$MnSi ($R$ = La, Ce, Pr, Nd)
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2025
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| author | Kawamura, Yukihiro Nishiyama, Sae Hayashi, Jun-ichi Takeda, Keiki Sekine, Chihiro Tanida, Hiroshi |
| author_facet | Kawamura, Yukihiro Nishiyama, Sae Hayashi, Jun-ichi Takeda, Keiki Sekine, Chihiro Tanida, Hiroshi |
| contents | Powder X-ray diffraction experiments under pressure up to $\sim$10 GPa were performed on tetragonal CeFeSi-type $R$MnSi ($R$ = La, Ce, Pr, Nd). A structural phase transition was observed in CeMnSi at a critical pressure of $P_{\rm s}$ $\sim$ 5.7 GPa. In contrast, LaMnSi, PrMnSi, and NdMnSi do not exhibit any structural transitions within the same pressure range. The lattice parameter ratio $c/a$ of CeMnSi decreases rapidly as pressure approaches $P_{\rm s}$, whereas the $c/a$ ratios of the other $R$MnSi increase monotonically with pressure. CeMnSi also shows a relatively small bulk modulus: $B_0$ $\sim$ 41.4(4) GPa in the 0--2 GPa range and $B_0$ $\sim$ 32.8(2) GPa in the 4--5 GPa range, suggesting valence instability under pressure. The structural transition in CeMnSi is attributed to the pressure-induced decrease in $c/a$ and its low bulk modulus. Above $P_{\rm s}$, the X-ray diffraction pattern indicates a transition to a monoclinic structure with space group No. 11, $P2_1/m$. These findings highlight the unique pressure response of CeMnSi and provide insight into the coupling between lattice and electronic degrees of freedom in Ce-based intermetallic systems. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_07210 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Structural Phase Transition in CeMnSi under Pressure and Comparative Structural Properties of $R$MnSi ($R$ = La, Ce, Pr, Nd) Kawamura, Yukihiro Nishiyama, Sae Hayashi, Jun-ichi Takeda, Keiki Sekine, Chihiro Tanida, Hiroshi Materials Science Strongly Correlated Electrons Powder X-ray diffraction experiments under pressure up to $\sim$10 GPa were performed on tetragonal CeFeSi-type $R$MnSi ($R$ = La, Ce, Pr, Nd). A structural phase transition was observed in CeMnSi at a critical pressure of $P_{\rm s}$ $\sim$ 5.7 GPa. In contrast, LaMnSi, PrMnSi, and NdMnSi do not exhibit any structural transitions within the same pressure range. The lattice parameter ratio $c/a$ of CeMnSi decreases rapidly as pressure approaches $P_{\rm s}$, whereas the $c/a$ ratios of the other $R$MnSi increase monotonically with pressure. CeMnSi also shows a relatively small bulk modulus: $B_0$ $\sim$ 41.4(4) GPa in the 0--2 GPa range and $B_0$ $\sim$ 32.8(2) GPa in the 4--5 GPa range, suggesting valence instability under pressure. The structural transition in CeMnSi is attributed to the pressure-induced decrease in $c/a$ and its low bulk modulus. Above $P_{\rm s}$, the X-ray diffraction pattern indicates a transition to a monoclinic structure with space group No. 11, $P2_1/m$. These findings highlight the unique pressure response of CeMnSi and provide insight into the coupling between lattice and electronic degrees of freedom in Ce-based intermetallic systems. |
| title | Structural Phase Transition in CeMnSi under Pressure and Comparative Structural Properties of $R$MnSi ($R$ = La, Ce, Pr, Nd) |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.07210 |