Anisotropy of the Upper Critical Field in the Heavy-Fermion Superconductor UTe2 under Pressure
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| Format: | Preprint |
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2020
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| author | Knebel, Georg Kimata, Motoi Vališka, Michal Honda, Fuminori Li, Dexin Braithwaite, Daniel Lapertot, Gérard Knafo, William Pourret, Alexandre Sato, Yoshiki J. Shimizu, Yusei Kihara, Takumi Brison, Jean-Pascal Flouquet, Jacques Aoki, Dai |
| author_facet | Knebel, Georg Kimata, Motoi Vališka, Michal Honda, Fuminori Li, Dexin Braithwaite, Daniel Lapertot, Gérard Knafo, William Pourret, Alexandre Sato, Yoshiki J. Shimizu, Yusei Kihara, Takumi Brison, Jean-Pascal Flouquet, Jacques Aoki, Dai |
| contents | We studied the anisotropy of the superconducting upper critical field $H_{\rm c2}$ in the heavy-fermion superconductor UTe$_2$ under hydrostatic pressure by magnetoresistivity measurements. In agreement with previous experiments we confirm that superconductivity disappears near a critical pressure $p_{\rm c} \approx 1.5$~GPa, and a magnetically ordered state appears. The unusual $H_{\rm c2}(T)$ at low temperatures for $H \parallel a$ suggests that the multiple superconducting phases which appear under pressure have quite different $H_{\rm c2}$. For a field applied along the hard magnetization $b$ axis $H_{\rm c2} (0)$ is glued to the metamagnetic transition $H_{\rm m}$ which is suppressed near $p_{\rm c}$. The suppression of $H_{\rm m}$ with pressure follows the decrease of temperature $T_χ^{\rm max}$, at the maximum in the susceptibility along $b$. The strong reinforcement of $H_{\rm c2}$ at ambient pressure for $H \parallel b$ above 16~T is rapidly suppressed under pressure due to the increase of $T_{\rm sc}$ and the decrease of $H_{\rm m}$. The change in the hierarchy of the anisotropy of $H_{\rm c2}(0)$ on approaching $p_{\rm c}$ points out that the $c$ axis becomes the hard magnetization axis. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2003_08728 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Anisotropy of the Upper Critical Field in the Heavy-Fermion Superconductor UTe2 under Pressure Knebel, Georg Kimata, Motoi Vališka, Michal Honda, Fuminori Li, Dexin Braithwaite, Daniel Lapertot, Gérard Knafo, William Pourret, Alexandre Sato, Yoshiki J. Shimizu, Yusei Kihara, Takumi Brison, Jean-Pascal Flouquet, Jacques Aoki, Dai Strongly Correlated Electrons We studied the anisotropy of the superconducting upper critical field $H_{\rm c2}$ in the heavy-fermion superconductor UTe$_2$ under hydrostatic pressure by magnetoresistivity measurements. In agreement with previous experiments we confirm that superconductivity disappears near a critical pressure $p_{\rm c} \approx 1.5$~GPa, and a magnetically ordered state appears. The unusual $H_{\rm c2}(T)$ at low temperatures for $H \parallel a$ suggests that the multiple superconducting phases which appear under pressure have quite different $H_{\rm c2}$. For a field applied along the hard magnetization $b$ axis $H_{\rm c2} (0)$ is glued to the metamagnetic transition $H_{\rm m}$ which is suppressed near $p_{\rm c}$. The suppression of $H_{\rm m}$ with pressure follows the decrease of temperature $T_χ^{\rm max}$, at the maximum in the susceptibility along $b$. The strong reinforcement of $H_{\rm c2}$ at ambient pressure for $H \parallel b$ above 16~T is rapidly suppressed under pressure due to the increase of $T_{\rm sc}$ and the decrease of $H_{\rm m}$. The change in the hierarchy of the anisotropy of $H_{\rm c2}(0)$ on approaching $p_{\rm c}$ points out that the $c$ axis becomes the hard magnetization axis. |
| title | Anisotropy of the Upper Critical Field in the Heavy-Fermion Superconductor UTe2 under Pressure |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2003.08728 |