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

Author:

Helm ToniORCID,Kimata MotoiORCID,Sudo Kenta,Miyata Atsuhiko,Stirnat Julia,Förster Tobias,Hornung Jacob,König Markus,Sheikin IlyaORCID,Pourret AlexandreORCID,Lapertot GerardORCID,Aoki Dai,Knebel GeorgORCID,Wosnitza Joachim,Brison Jean-PascalORCID

Abstract

AbstractThe 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 μ0Hm ≈ 35 T. It is associated with magnetic fluctuations that may be beneficial for the field-reinforced superconductivity surviving up to Hm. Once the field is tilted away from the b towards the c axis, a reentrant superconducting phase emerges just above Hm. 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 μ0Hc2 ≈ 73 T and its evolution with angle. Furthermore, the normal-state Hall effect experiences a drastic suppression indicative of a reduced band polarization above Hm 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 Hm.

Funder

Deutsche Forschungsgemeinschaft

Publisher

Springer Science and Business Media LLC

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