---
OA_place: repository
OA_type: free access
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abstract:
- lang: eng
text: UTe2 exhibits the remarkable phenomenon of re-entrant superconductivity, whereby
the zero-resistance state reappears above 40 tesla after being suppressed with
a field of around 10 tesla. One potential pairing mechanism, invoked in the related
re-entrant superconductors UCoGe and URhGe, involves transverse fluctuations of
a ferromagnetic order parameter. However, the requisite ferromagnetic order -
present in both UCoGe and URhGe - is absent in UTe2, and magnetization measurements
show no sign of strong fluctuations. Here, we measure the magnetotropic susceptibility
of UTe2 across two field-angle planes. This quantity is sensitive to the magnetic
susceptibility in a direction transverse to the applied magnetic field - a quantity
that is not accessed in conventional magnetization measurements. We observe a
very large decrease in the magnetotropic susceptibility over a broad range of
field orientations, indicating a large increase in the transverse magnetic susceptibility.
The three superconducting phases of UTe2, including the high-field re-entrant
phase, surround this region of enhanced susceptibility in the field-angle phase
diagram. The strongest transverse susceptibility is found near the critical end
point of the high-field metamagnetic transition, suggesting that quantum critical
fluctuations of a field-induced magnetic order parameter may be responsible for
the large transverse susceptibility, and may provide a pairing mechanism for field-induced
superconductivity in UTe2.
acknowledged_ssus:
- _id: NanoFab
acknowledgement: Thanks to Salvatore Bagiante, Evgeniia Volobueva, Lubuna Shafeek,
Ali Bangura and Zoltan Kollo.
article_processing_charge: Yes
author:
- first_name: Kimberly A
full_name: Modic, Kimberly A
id: 13C26AC0-EB69-11E9-87C6-5F3BE6697425
last_name: Modic
orcid: 0000-0001-9760-3147
citation:
ama: Modic KA. Research data for “Giant transverse magnetic fluctuations at the
edge of re-entrant superconductivity in UTe2.” 2026. doi:10.15479/AT-ISTA-21174
apa: Modic, K. A. (2026). Research data for “Giant transverse magnetic fluctuations
at the edge of re-entrant superconductivity in UTe2.” Institute of Science and
Technology Austria. https://doi.org/10.15479/AT-ISTA-21174
chicago: Modic, Kimberly A. “Research Data for ‘Giant Transverse Magnetic Fluctuations
at the Edge of Re-Entrant Superconductivity in UTe2.’” Institute of Science and
Technology Austria, 2026. https://doi.org/10.15479/AT-ISTA-21174.
ieee: K. A. Modic, “Research data for ‘Giant transverse magnetic fluctuations at
the edge of re-entrant superconductivity in UTe2.’” Institute of Science and Technology
Austria, 2026.
ista: Modic KA. 2026. Research data for ‘Giant transverse magnetic fluctuations
at the edge of re-entrant superconductivity in UTe2’, Institute of Science and
Technology Austria, 10.15479/AT-ISTA-21174.
mla: Modic, Kimberly A. Research Data for “Giant Transverse Magnetic Fluctuations
at the Edge of Re-Entrant Superconductivity in UTe2.” Institute of Science
and Technology Austria, 2026, doi:10.15479/AT-ISTA-21174.
short: K.A. Modic, (2026).
contributor:
- contributor_type: project_member
first_name: Valeska
id: 467ed36b-dc96-11ea-b7c8-b043a380b282
last_name: Zambra
orcid: 0000-0002-8806-5719
corr_author: '1'
date_created: 2026-02-09T12:04:20Z
date_published: 2026-02-19T00:00:00Z
date_updated: 2026-05-11T06:35:59Z
day: '19'
ddc:
- '530'
department:
- _id: KiMo
doi: 10.15479/AT-ISTA-21174
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has_accepted_license: '1'
keyword:
- transverse magnetic susceptibility
- magnetotropic
- superconductivity
- magnetic fluctuations
license: https://creativecommons.org/licenses/by/4.0/
month: '02'
oa: 1
oa_version: Published Version
project:
- _id: bd968c70-d553-11ed-ba76-cde40b0aba64
grant_number: '101078696'
name: Gaining leverage with spin liquids and superconductors
publisher: Institute of Science and Technology Austria
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url: https://arxiv.org/pdf/2506.08984
record:
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title: Research data for "Giant transverse magnetic fluctuations at the edge of re-entrant
superconductivity in UTe2"
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
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...
---
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abstract:
- lang: eng
text: UTe2 exhibits the remarkable phenomenon of re-entrant superconductivity, whereby
the zero-resistance state reappears above 40 tesla after being suppressed with
a field of around 10 tesla. One potential pairing mechanism, invoked in the related
re-entrant superconductors UCoGe and URhGe, involves transverse fluctuations of
a ferromagnetic order parameter. However, the requisite ferromagnetic order—present
in both UCoGe and URhGe—is absent in UTe2, and neutron scattering shows instead
that the magnetic susceptibility is peaked at an antiferromagnetic wavevector.
Here, we measure the magnetotropic susceptibility of UTe2 across two field-angle
planes. This quantity is sensitive to the magnetic susceptibility in a direction
transverse to the applied magnetic field—a quantity that is not accessed in conventional
magnetization measurements. We observe a very large decrease in the magnetotropic
susceptibility over a broad range of field orientations, indicating a large increase
in the transverse magnetic susceptibility. Because our technique probes the magnetic
susceptibility in the long wavelength (q = 0) limit, this suggests that the strong
transverse susceptibility arises from ferromagnetic spin fluctuations. These ferromagnetic
fluctuations are likely important for understanding the pairing mechanism in UTe2,
as all three superconducting phases of UTe2 surround this region of enhanced susceptibility
in the field-angle phase diagram.
acknowledged_ssus:
- _id: NanoFab
acknowledgement: We appreciate technical support from Salvatore Bagiante, Evgeniia
Volobueva, Lubuna Shafeek, Ali Bangura, and Zoltán Köllö, and scientific discussions
with Daniel Agterberg, Johnpierre Paglione, Qimiao Si, Josephine Yu and Yue Yu.
V.Z., A.N., M.N., and K.A.M. acknowledge funding received from the European Research
Council (ERC) under the European Union’s Horizon 2020 research and innovation programme
(TROPIC-101078696). V.Z., A.N., M.N., and K.A.M. thank the ISTA Nanofabrication
Facility for technical support. B.J.R. acknowledges funding from the Office of Basic
Energy Sciences of the United States Department of Energy under award number DE-SC0020143
for data analysis and writing. The National High Magnetic Field Laboratory is supported
by the National Science Foundation through NSF/DMR-2128556*, the State of Florida,
and the U.S. Department of Energy. A.S. acknowledges support from the DOE/BES “Science
of 100 T” grant. A.S. thanks Downtown Subscription in Santa Fe, NM, for their patience
in hosting him. Sample preparation and characterization were supported by the NSF
through DMR-2105191.
article_number: '3742'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Valeska
full_name: Zambra, Valeska
id: 467ed36b-dc96-11ea-b7c8-b043a380b282
last_name: Zambra
orcid: 0000-0002-8806-5719
- first_name: Amit
full_name: Nathwani, Amit
id: 1a362536-4d02-11f1-8543-8351136efc50
last_name: Nathwani
- first_name: Muhammad
full_name: Nauman, Muhammad
id: 32c21954-2022-11eb-9d5f-af9f93c24e71
last_name: Nauman
orcid: 0000-0002-2111-4846
- first_name: Sylvia K.
full_name: Lewin, Sylvia K.
last_name: Lewin
- first_name: Corey E.
full_name: Frank, Corey E.
last_name: Frank
- first_name: Nicholas P.
full_name: Butch, Nicholas P.
last_name: Butch
- first_name: Arkady
full_name: Shekhter, Arkady
last_name: Shekhter
- first_name: B. J.
full_name: Ramshaw, B. J.
last_name: Ramshaw
- first_name: Kimberly A
full_name: Modic, Kimberly A
id: 13C26AC0-EB69-11E9-87C6-5F3BE6697425
last_name: Modic
orcid: 0000-0001-9760-3147
citation:
ama: Zambra V, Nathwani A, Nauman M, et al. Giant transverse magnetic fluctuations
at the edge of re-entrant superconductivity in UTe2. Nature Communications.
2026;17. doi:10.1038/s41467-026-71899-7
apa: Zambra, V., Nathwani, A., Nauman, M., Lewin, S. K., Frank, C. E., Butch, N.
P., … Modic, K. A. (2026). Giant transverse magnetic fluctuations at the edge
of re-entrant superconductivity in UTe2. Nature Communications. Springer
Nature. https://doi.org/10.1038/s41467-026-71899-7
chicago: Zambra, Valeska, Amit Nathwani, Muhammad Nauman, Sylvia K. Lewin, Corey
E. Frank, Nicholas P. Butch, Arkady Shekhter, B. J. Ramshaw, and Kimberly A Modic.
“Giant Transverse Magnetic Fluctuations at the Edge of Re-Entrant Superconductivity
in UTe2.” Nature Communications. Springer Nature, 2026. https://doi.org/10.1038/s41467-026-71899-7.
ieee: V. Zambra et al., “Giant transverse magnetic fluctuations at the edge
of re-entrant superconductivity in UTe2,” Nature Communications, vol. 17.
Springer Nature, 2026.
ista: Zambra V, Nathwani A, Nauman M, Lewin SK, Frank CE, Butch NP, Shekhter A,
Ramshaw BJ, Modic KA. 2026. Giant transverse magnetic fluctuations at the edge
of re-entrant superconductivity in UTe2. Nature Communications. 17, 3742.
mla: Zambra, Valeska, et al. “Giant Transverse Magnetic Fluctuations at the Edge
of Re-Entrant Superconductivity in UTe2.” Nature Communications, vol. 17,
3742, Springer Nature, 2026, doi:10.1038/s41467-026-71899-7.
short: V. Zambra, A. Nathwani, M. Nauman, S.K. Lewin, C.E. Frank, N.P. Butch, A.
Shekhter, B.J. Ramshaw, K.A. Modic, Nature Communications 17 (2026).
corr_author: '1'
date_created: 2026-05-10T22:02:15Z
date_published: 2026-04-29T00:00:00Z
date_updated: 2026-05-11T06:36:00Z
day: '29'
ddc:
- '530'
department:
- _id: KiMo
- _id: GradSch
doi: 10.1038/s41467-026-71899-7
external_id:
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- '2506.08984'
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intvolume: ' 17'
language:
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month: '04'
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oa_version: Published Version
project:
- _id: bd968c70-d553-11ed-ba76-cde40b0aba64
grant_number: '101078696'
name: Gaining leverage with spin liquids and superconductors
publication: Nature Communications
publication_identifier:
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publisher: Springer Nature
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title: Giant transverse magnetic fluctuations at the edge of re-entrant superconductivity
in UTe2
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
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...