Anisotropy of the Upper Critical Field in the Heavy-Fermion Superconductor UTe2 under Pressure - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2020

Anisotropy of the Upper Critical Field in the Heavy-Fermion Superconductor UTe2 under Pressure

Motoi Kimata
Fuminori Honda
Yusei Shimizu

Résumé

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 $T_{\chi}^{\rm max}$, 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.

Dates et versions

hal-02988466 , version 1 (24-06-2020)
hal-02988466 , version 2 (24-11-2020)

Identifiants

Citer

Georg Knebel, Motoi Kimata, Michal Vališka, Fuminori Honda, Dexin Li, et al.. Anisotropy of the Upper Critical Field in the Heavy-Fermion Superconductor UTe2 under Pressure. 2020. ⟨hal-02988466v1⟩
131 Consultations
114 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More