Search for quantum-tricritical-point in antiferromagnet CeRu$_2$(Si$_{1-x}$Ge$_x$)$_2$
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911267750412288 |
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| author | Shinya, H. Ito, F. Kabeya, N. Mizukami, Y. Kimura, N. |
| author_facet | Shinya, H. Ito, F. Kabeya, N. Mizukami, Y. Kimura, N. |
| contents | CeRu$_2$Si$_2$ is a well-known heavy fermion paramagnet, and substituting Ge for Si induces antiferromagnetism. This antiferromagnetism is Ising-like and has a tricritical point in the magnetic field ($H$) -temperature ($T$) phase diagram. Since the temperature of the tricritical point is expected to decrease with increasing pressure ($P$), we investigated the pressure dependence of the magnetic phase transitions. We determined the $H$-$P$ phase diagram and revealed that a first-order phase-transition line changes to a quantum critical line, which implies the existence of the quantum tricritical point. A ferromagnetic quantum fluctuation arises in the vicinity of the possible quantum tricritical point. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_12078 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Search for quantum-tricritical-point in antiferromagnet CeRu$_2$(Si$_{1-x}$Ge$_x$)$_2$ Shinya, H. Ito, F. Kabeya, N. Mizukami, Y. Kimura, N. Strongly Correlated Electrons CeRu$_2$Si$_2$ is a well-known heavy fermion paramagnet, and substituting Ge for Si induces antiferromagnetism. This antiferromagnetism is Ising-like and has a tricritical point in the magnetic field ($H$) -temperature ($T$) phase diagram. Since the temperature of the tricritical point is expected to decrease with increasing pressure ($P$), we investigated the pressure dependence of the magnetic phase transitions. We determined the $H$-$P$ phase diagram and revealed that a first-order phase-transition line changes to a quantum critical line, which implies the existence of the quantum tricritical point. A ferromagnetic quantum fluctuation arises in the vicinity of the possible quantum tricritical point. |
| title | Search for quantum-tricritical-point in antiferromagnet CeRu$_2$(Si$_{1-x}$Ge$_x$)$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2511.12078 |