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Article Dans Une Revue Physical Review X Année : 2023

Field-Induced Tuning of the Pairing State in a Superconductor

D. Aoki

Résumé

The recently discovered superconductor UTe2, with a superconducting transition temperature Tc between 1.5 and 2 K, is attracting much attention due to strong suspicion of spin-triplet and topological,nsuperconductivity. Its properties under magnetic field are also remarkable, with field-reinforced (Hkb) and field-induced [H in the ðb; cÞ plane] superconducting phases. Here, we report the first complete thermodynamic determination of the phase diagram for fields applied along the three crystallographic directions. For field along the easy a axis, we uncover a strong negative curvature of the upper critical field very close to Tc, revealing a strong suppression of the pairing strength at low magnetic fields. By contrast, measurements performed up to 36 T along the hard magnetization b axis confirm a bulk field-reinforced superconducting phase. Most of all, they also reveal the existence of a phase transition line within the superconducting phase. Drastic differences occur between the low-field and high-field phases pointing to different pairing mechanisms. Detailed analysis suggests a possible transition between a low-field spin-triplet to high-field spin-singlet state, a unique case among superconductors
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Origine : Publication financée par une institution

Dates et versions

hal-04004371 , version 1 (25-05-2023)

Identifiants

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A. Rosuel, C. Marcenat, G. Knebel, T. Klein, A. Pourret, et al.. Field-Induced Tuning of the Pairing State in a Superconductor. Physical Review X, 2023, 13 (1), pp.011022. ⟨10.1103/PhysRevX.13.011022⟩. ⟨hal-04004371⟩
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