Rotational Grüneisen ratio: a probe for quantum criticality in anisotropic systems
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929669676204032 |
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| author | Yuasa, Shohei Kono, Yohei Ozaki, Yuta Yamashita, Minoru Shimura, Yasuyuki Takabatake, Toshiro Kittaka, Shunichiro |
| author_facet | Yuasa, Shohei Kono, Yohei Ozaki, Yuta Yamashita, Minoru Shimura, Yasuyuki Takabatake, Toshiro Kittaka, Shunichiro |
| contents | The Grüneisen ratio $Γ$ and its magnetic analog, the magnetic Grüneisen ratio $Γ_H$, are powerful probes to study the nature of quantum phase transitions. Here, we propose a Grüneisen parameter, the rotational Grüneisen ratio $Γ_ϕ$, by introducing the orientation of the external field as a control parameter. We investigate $Γ_ϕ$ of the highly anisotropic paramagnets CeRhSn and CeIrSn by measuring the rotational magnetocaloric effect in a wide range of temperatures and magnetic fields. We find that the $Γ_ϕ$ data of both compounds are scaled by using the same critical exponents and the field-invariant critical field angle. Remarkably, the scaling function for the $Γ_ϕ$ data reveals the presence of highly anisotropic quantum criticality that develops as a function of the easy-axis component of the magnetic field from the quantum critical line. This paper provides a thermodynamic approach to detect and identify magnetic quantum criticality in highly anisotropic systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_09047 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Rotational Grüneisen ratio: a probe for quantum criticality in anisotropic systems Yuasa, Shohei Kono, Yohei Ozaki, Yuta Yamashita, Minoru Shimura, Yasuyuki Takabatake, Toshiro Kittaka, Shunichiro Strongly Correlated Electrons The Grüneisen ratio $Γ$ and its magnetic analog, the magnetic Grüneisen ratio $Γ_H$, are powerful probes to study the nature of quantum phase transitions. Here, we propose a Grüneisen parameter, the rotational Grüneisen ratio $Γ_ϕ$, by introducing the orientation of the external field as a control parameter. We investigate $Γ_ϕ$ of the highly anisotropic paramagnets CeRhSn and CeIrSn by measuring the rotational magnetocaloric effect in a wide range of temperatures and magnetic fields. We find that the $Γ_ϕ$ data of both compounds are scaled by using the same critical exponents and the field-invariant critical field angle. Remarkably, the scaling function for the $Γ_ϕ$ data reveals the presence of highly anisotropic quantum criticality that develops as a function of the easy-axis component of the magnetic field from the quantum critical line. This paper provides a thermodynamic approach to detect and identify magnetic quantum criticality in highly anisotropic systems. |
| title | Rotational Grüneisen ratio: a probe for quantum criticality in anisotropic systems |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2412.09047 |