Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe2
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Contributors
Abstract
The potential spin-triplet heavy-fermion superconductor UTe2 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.
Details
Original language | English |
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Article number | 37 |
Journal | Nature communications |
Volume | 15 |
Publication status | Published - 2 Jan 2024 |
Peer-reviewed | Yes |
External IDs
PubMed | 38167667 |
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