Boosted magnetic fluctuations at the onset of superconductivity in UTe$_2$ beyond 40 T
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arXiv
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911693187055616 |
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| author | Thebault, T. Somesh, K. Lapertot, G. Nardone, M. Zitouni, A. Barragan, M. Béard, J. Billette, J. Lecouturier, F. Tardieu, S. Aoki, D. Knebel, G. Braithwaite, D. Knafo, W. |
| author_facet | Thebault, T. Somesh, K. Lapertot, G. Nardone, M. Zitouni, A. Barragan, M. Béard, J. Billette, J. Lecouturier, F. Tardieu, S. Aoki, D. Knebel, G. Braithwaite, D. Knafo, W. |
| contents | Several unconventional superconducting phases have been discovered close to a metamagnetic transition in the heavy-fermion compound UTe$_2$. Although suspected to be of magnetic nature, the mechanisms stabilizing these superconducting phases remain mysterious. Here, we present electrical-resistivity measurements on UTe$_2$, with a current $\mathbf{I}\parallel\mathbf{a}$ and under pulsed magnetic fields up to 60~T rotating in the ($\mathbf{b}$,$\mathbf{c}$) plane. We find that the maximum of the Fermi-liquid coefficient $A$ at the metamagnetic transition is enhanced under magnetic fields tilted by $30-40~^\circ$ from $\mathbf{b}$ to $\mathbf{c}$. The enhancement of $A$ coincides with the stabilization of superconductivity in the polarized paramagnetic regime beyond the metamagnetic field $μ_0H_m\gtrsim40$~T. It is the signature of a boosted quantum-critical magnetic-fluctuation mode probably in play for the mechanism of this superconducting phase. This result appeals for descriptions of the interplay between magnetic-field-induced superconductivity and quantum critical magnetic properties. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_09351 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Boosted magnetic fluctuations at the onset of superconductivity in UTe$_2$ beyond 40 T Thebault, T. Somesh, K. Lapertot, G. Nardone, M. Zitouni, A. Barragan, M. Béard, J. Billette, J. Lecouturier, F. Tardieu, S. Aoki, D. Knebel, G. Braithwaite, D. Knafo, W. Strongly Correlated Electrons Superconductivity Several unconventional superconducting phases have been discovered close to a metamagnetic transition in the heavy-fermion compound UTe$_2$. Although suspected to be of magnetic nature, the mechanisms stabilizing these superconducting phases remain mysterious. Here, we present electrical-resistivity measurements on UTe$_2$, with a current $\mathbf{I}\parallel\mathbf{a}$ and under pulsed magnetic fields up to 60~T rotating in the ($\mathbf{b}$,$\mathbf{c}$) plane. We find that the maximum of the Fermi-liquid coefficient $A$ at the metamagnetic transition is enhanced under magnetic fields tilted by $30-40~^\circ$ from $\mathbf{b}$ to $\mathbf{c}$. The enhancement of $A$ coincides with the stabilization of superconductivity in the polarized paramagnetic regime beyond the metamagnetic field $μ_0H_m\gtrsim40$~T. It is the signature of a boosted quantum-critical magnetic-fluctuation mode probably in play for the mechanism of this superconducting phase. This result appeals for descriptions of the interplay between magnetic-field-induced superconductivity and quantum critical magnetic properties. |
| title | Boosted magnetic fluctuations at the onset of superconductivity in UTe$_2$ beyond 40 T |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2505.09351 |