Stability of the first-order character of phase transition in HoCo$_2$
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866908362788044800 |
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| author | Kumar, Ajay Biswas, Anis Mudryk, Yaroslav |
| author_facet | Kumar, Ajay Biswas, Anis Mudryk, Yaroslav |
| contents | HoCo$_2$ exhibits a giant magnetocaloric (MC) effect at its first-order magnetostructural phase transition around 77~K, and understanding the thermodynamic nature of this transition in response to external magnetic fields is crucial for its MC applications. In this study, we present a comprehensive investigation of specific heat and magnetization measurements of HoCo$_2$ under varying magnetic fields. The specific heat measurements qualitatively indicate a transformation from first- to second-order behavior of this phase transition at higher magnetic fields. However, analysis of the power-law dependence of the magnetic entropy change ($ΔS_{\rm M} \propto$ H$^n$) and the breakdown of universal behavior in the temperature dependence of $ΔS_{\rm M}$ suggest that the first-order nature remains intact, even up to 7 T. This stability of the first-order nature is further manifested through the distinctive non-linear behavior of modified Arrott plots, with a negative slope in the 6--7 T range. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_05509 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Stability of the first-order character of phase transition in HoCo$_2$ Kumar, Ajay Biswas, Anis Mudryk, Yaroslav Materials Science Strongly Correlated Electrons HoCo$_2$ exhibits a giant magnetocaloric (MC) effect at its first-order magnetostructural phase transition around 77~K, and understanding the thermodynamic nature of this transition in response to external magnetic fields is crucial for its MC applications. In this study, we present a comprehensive investigation of specific heat and magnetization measurements of HoCo$_2$ under varying magnetic fields. The specific heat measurements qualitatively indicate a transformation from first- to second-order behavior of this phase transition at higher magnetic fields. However, analysis of the power-law dependence of the magnetic entropy change ($ΔS_{\rm M} \propto$ H$^n$) and the breakdown of universal behavior in the temperature dependence of $ΔS_{\rm M}$ suggest that the first-order nature remains intact, even up to 7 T. This stability of the first-order nature is further manifested through the distinctive non-linear behavior of modified Arrott plots, with a negative slope in the 6--7 T range. |
| title | Stability of the first-order character of phase transition in HoCo$_2$ |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2411.05509 |