Three-stage Phase Transitions and Field-induced Phases in CeCoSi:A Landau Theory
Fuente:
arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866909660511993856 |
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| author | Ishitobi, Takayuki |
| author_facet | Ishitobi, Takayuki |
| contents | We investigate both the nonmagnetic and magnetic ordered phases of CeCoSi using Landau theory. Our analysis predicts three successive phase transitions at zero magnetic field. A quadrupole order parameter that emerges below $T_0=12$ K acts as a weak symmetry-breaking field on the antiferromagnetic ordering below $T_{\rm N}=9.4$ K, leading to two-stage magnetic transitions. In the higher-temperature antiferromagnetic phase within the range $T_{\rm s2}=8~{\rm K}<T<T_{\rm N}$, an out-of-plane component of the antiferromagnetic moment may or may not be present. If present, magnetic fields applied along the [100] and [110] directions induce additional magnetic phases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_13188 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Three-stage Phase Transitions and Field-induced Phases in CeCoSi:A Landau Theory Ishitobi, Takayuki Strongly Correlated Electrons We investigate both the nonmagnetic and magnetic ordered phases of CeCoSi using Landau theory. Our analysis predicts three successive phase transitions at zero magnetic field. A quadrupole order parameter that emerges below $T_0=12$ K acts as a weak symmetry-breaking field on the antiferromagnetic ordering below $T_{\rm N}=9.4$ K, leading to two-stage magnetic transitions. In the higher-temperature antiferromagnetic phase within the range $T_{\rm s2}=8~{\rm K}<T<T_{\rm N}$, an out-of-plane component of the antiferromagnetic moment may or may not be present. If present, magnetic fields applied along the [100] and [110] directions induce additional magnetic phases. |
| title | Three-stage Phase Transitions and Field-induced Phases in CeCoSi:A Landau Theory |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2504.13188 |