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Article Dans Une Revue Nature Communications Année : 2024

Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe2

Toni Helm

Résumé

Abstract The potential spin-triplet heavy-fermion superconductor UTe 2 exhibits signatures of multiple distinct superconducting phases. For field aligned along the b axis, a metamagnetic transition occurs at μ 0 H m ≈ 35 T. It is associated with magnetic fluctuations that may be beneficial for the field-reinforced superconductivity surviving up to H m . Once the field is tilted away from the b towards the c axis, a reentrant superconducting phase emerges just above H m . In order to better understand this remarkably field-resistant superconducting phase, we conducted magnetic-torque and magnetotransport measurements in pulsed magnetic fields. We determine the record-breaking upper critical field of μ 0 H c2 ≈ 73 T and its evolution with angle. Furthermore, the normal-state Hall effect experiences a drastic suppression indicative of a reduced band polarization above H m in the angular range around 30° caused by a partial compensation between the applied field and an exchange field. This promotes the Jaccarino-Peter effect as a likely mechanism for the reentrant superconductivity above H m .

Dates et versions

hal-04373212 , version 1 (04-01-2024)

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Citer

Toni Helm, Motoi Kimata, Kenta Sudo, Atsuhiko Miyata, Julia Stirnat, et al.. Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe2. Nature Communications, 2024, 15 (1), pp.37. ⟨10.1038/s41467-023-44183-1⟩. ⟨hal-04373212⟩
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