Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe$_2$
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arXiv
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| Auteurs principaux: | , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866910416790093824 |
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| author | Tokiwa, Y. Opletal, . P. Sakai, H. Kambe, S. Yamamoto, E. Kimata, M. Awaji, S. Sasaki, T. Aoki, D. Haga, Y. Tokunaga, Y. |
| author_facet | Tokiwa, Y. Opletal, . P. Sakai, H. Kambe, S. Yamamoto, E. Kimata, M. Awaji, S. Sasaki, T. Aoki, D. Haga, Y. Tokunaga, Y. |
| contents | The normal-conducting state of the superconductor UTe$_2$ is studied by entropy analysis for magnetic fields along the $b$-axis, obtained from magnetization using the relation $(\partial M/\partial T)_B=(\partial S/\partial B)_T$. We observe a strong increase in entropy with magnetic field due to metamagnetic fluctuations (spatially uniform, $Q=0$). The field dependence is well described by the Hertz-Millis-Moriya theory for quantum criticality of itinerant metamagnetism. Notably, the lower bound of the quantum-critical region coincides well with the position of the minimum in the superconducting transition temperature $T_c(B)$. Hence, our results suggest that $Q=0$ fluctuations reinforce the superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_16258 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe$_2$ Tokiwa, Y. Opletal, . P. Sakai, H. Kambe, S. Yamamoto, E. Kimata, M. Awaji, S. Sasaki, T. Aoki, D. Haga, Y. Tokunaga, Y. Superconductivity Strongly Correlated Electrons The normal-conducting state of the superconductor UTe$_2$ is studied by entropy analysis for magnetic fields along the $b$-axis, obtained from magnetization using the relation $(\partial M/\partial T)_B=(\partial S/\partial B)_T$. We observe a strong increase in entropy with magnetic field due to metamagnetic fluctuations (spatially uniform, $Q=0$). The field dependence is well described by the Hertz-Millis-Moriya theory for quantum criticality of itinerant metamagnetism. Notably, the lower bound of the quantum-critical region coincides well with the position of the minimum in the superconducting transition temperature $T_c(B)$. Hence, our results suggest that $Q=0$ fluctuations reinforce the superconductivity. |
| title | Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe$_2$ |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2402.16258 |