Possible coexistence of antiferromagnetic and ferromagnetic spin fluctuations in the spin-triplet superconductor UTe2 revealed by Te 125 NMR under pressure

Devi V. Ambika; Qing Ping Ding; Khusboo Rana; Corey E. Frank; Elizabeth L. Green; Sheng Ran; Nicholas P. Butch; Yuji Furukawa

doi:10.1103/PhysRevB.105.L220403

Possible coexistence of antiferromagnetic and ferromagnetic spin fluctuations in the spin-triplet superconductor UTe2 revealed by Te 125 NMR under pressure

Devi V. Ambika, Qing Ping Ding, Khusboo Rana, Corey E. Frank, Elizabeth L. Green, Sheng Ran, Nicholas P. Butch, Yuji Furukawa

Department of Physics

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

A spin-triplet superconducting state mediated by ferromagnetic (FM) spin fluctuations has been suggested to occur in the newly discovered heavy-fermion superconductor UTe2. However, the recent neutron scattering measurements revealed the presence of antiferromagnetic (AFM) spin fluctuations in UTe2. Here, we report the Te125 nuclear magnetic resonance studies of a single-crystal UTe2, suggesting the coexistence of FM and AFM spin fluctuations in UTe2. Owing to the two different Te sites in the compound, we conclude that the FM spin fluctuations are dominant within ladders and the AFM spin fluctuations originate from the interladder magnetic coupling. Although AFM spin fluctuations exist in the system, the FM spin fluctuations in the ladders may play an important role in the appearance of the spin-triplet superconducting state of UTe2.

Original language	English
Article number	L220403
Journal	Physical Review B
Volume	105
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.105.L220403
State	Published - Jun 1 2022

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title = "Possible coexistence of antiferromagnetic and ferromagnetic spin fluctuations in the spin-triplet superconductor UTe2 revealed by Te 125 NMR under pressure",

abstract = "A spin-triplet superconducting state mediated by ferromagnetic (FM) spin fluctuations has been suggested to occur in the newly discovered heavy-fermion superconductor UTe2. However, the recent neutron scattering measurements revealed the presence of antiferromagnetic (AFM) spin fluctuations in UTe2. Here, we report the Te125 nuclear magnetic resonance studies of a single-crystal UTe2, suggesting the coexistence of FM and AFM spin fluctuations in UTe2. Owing to the two different Te sites in the compound, we conclude that the FM spin fluctuations are dominant within ladders and the AFM spin fluctuations originate from the interladder magnetic coupling. Although AFM spin fluctuations exist in the system, the FM spin fluctuations in the ladders may play an important role in the appearance of the spin-triplet superconducting state of UTe2.",

author = "Ambika, \{Devi V.\} and Ding, \{Qing Ping\} and Khusboo Rana and Frank, \{Corey E.\} and Green, \{Elizabeth L.\} and Sheng Ran and Butch, \{Nicholas P.\} and Yuji Furukawa",

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doi = "10.1103/PhysRevB.105.L220403",

language = "English",

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T1 - Possible coexistence of antiferromagnetic and ferromagnetic spin fluctuations in the spin-triplet superconductor UTe2 revealed by Te 125 NMR under pressure

AU - Ambika, Devi V.

AU - Ding, Qing Ping

AU - Rana, Khusboo

AU - Frank, Corey E.

AU - Green, Elizabeth L.

AU - Ran, Sheng

AU - Butch, Nicholas P.

AU - Furukawa, Yuji

PY - 2022/6/1

Y1 - 2022/6/1

N2 - A spin-triplet superconducting state mediated by ferromagnetic (FM) spin fluctuations has been suggested to occur in the newly discovered heavy-fermion superconductor UTe2. However, the recent neutron scattering measurements revealed the presence of antiferromagnetic (AFM) spin fluctuations in UTe2. Here, we report the Te125 nuclear magnetic resonance studies of a single-crystal UTe2, suggesting the coexistence of FM and AFM spin fluctuations in UTe2. Owing to the two different Te sites in the compound, we conclude that the FM spin fluctuations are dominant within ladders and the AFM spin fluctuations originate from the interladder magnetic coupling. Although AFM spin fluctuations exist in the system, the FM spin fluctuations in the ladders may play an important role in the appearance of the spin-triplet superconducting state of UTe2.

AB - A spin-triplet superconducting state mediated by ferromagnetic (FM) spin fluctuations has been suggested to occur in the newly discovered heavy-fermion superconductor UTe2. However, the recent neutron scattering measurements revealed the presence of antiferromagnetic (AFM) spin fluctuations in UTe2. Here, we report the Te125 nuclear magnetic resonance studies of a single-crystal UTe2, suggesting the coexistence of FM and AFM spin fluctuations in UTe2. Owing to the two different Te sites in the compound, we conclude that the FM spin fluctuations are dominant within ladders and the AFM spin fluctuations originate from the interladder magnetic coupling. Although AFM spin fluctuations exist in the system, the FM spin fluctuations in the ladders may play an important role in the appearance of the spin-triplet superconducting state of UTe2.

UR - https://www.scopus.com/pages/publications/85133521636

U2 - 10.1103/PhysRevB.105.L220403

DO - 10.1103/PhysRevB.105.L220403

M3 - Article

AN - SCOPUS:85133521636

SN - 2469-9950

VL - 105

JO - Physical Review B

JF - Physical Review B

IS - 22

M1 - L220403

ER -

Possible coexistence of antiferromagnetic and ferromagnetic spin fluctuations in the spin-triplet superconductor UTe2 revealed by Te 125 NMR under pressure

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