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 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.
%0 Journal Article
%1 helm2024fieldinduced
%A Helm, Toni
%A Kimata, Motoi
%A Sudo, Kenta
%A Miyata, Atsuhiko
%A Stirnat, Julia
%A Förster, Tobias
%A Hornung, Jacob
%A König, Markus
%A Sheikin, Ilya
%A Pourret, Alexandre
%A Lapertot, Gerard
%A Aoki, Dai
%A Knebel, Georg
%A Wosnitza, Joachim
%A Brison, Jean-Pascal
%D 2024
%J Nat. Commun
%K a
%N 1
%P 37
%R 10.1038/s41467-023-44183-1
%T Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe$_2$
%U https://doi.org/10.1038/s41467-023-44183-1
%V 15
%X 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 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.
@article{helm2024fieldinduced,
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 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.},
added-at = {2024-01-08T10:08:13.000+0100},
author = {Helm, Toni and Kimata, Motoi and Sudo, Kenta and Miyata, Atsuhiko and Stirnat, Julia and Förster, Tobias and Hornung, Jacob and König, Markus and Sheikin, Ilya and Pourret, Alexandre and Lapertot, Gerard and Aoki, Dai and Knebel, Georg and Wosnitza, Joachim and Brison, Jean-Pascal},
biburl = {https://www.bibsonomy.org/bibtex/2def8d48929c3d63058a3d61985787b28/ctqmat},
day = 02,
doi = {10.1038/s41467-023-44183-1},
interhash = {caee26bb2ea8e7660828a832753f1390},
intrahash = {def8d48929c3d63058a3d61985787b28},
issn = {20411723},
journal = {Nat. Commun},
keywords = {a},
month = {01},
number = 1,
pages = 37,
refid = {Helm2024},
timestamp = {2024-01-23T11:11:02.000+0100},
title = {Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe$_{\mathbf{2}}$},
url = {https://doi.org/10.1038/s41467-023-44183-1},
volume = 15,
year = 2024
}