Incommensurate Spin Fluctuations in the Spin-Triplet Superconductor Candidate UTe2

Duan, Chunruo; Sasmal, Kalyan; Maple, M. Brian; Podlesnyak, Andrey; Zhu, Jian-Xin; Si, Qimiao; Dai, Pengcheng

doi:10.1103/physrevlett.125.237003

Title: Incommensurate Spin Fluctuations in the Spin-Triplet Superconductor Candidate UTe₂

Journal Article · 01 December 2020 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.125.237003 · OSTI ID:1735405

Duan, Chunruo ^[1]; Sasmal, Kalyan ^[2]; Maple, M. Brian ^[2];

^[3];

^[4]; Si, Qimiao ^[1];

^[1]

Rice Univ., Houston, TX (United States)
Univ. of California, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)

Spin-triplet superconductors are of extensive current interest because they can host topological state and Majorana fermions important for quantum computation. The uranium-based heavy-fermion superconductor UTe₂ has been argued as a spin-triplet superconductor similar to UGe2, URhGe, and UCoGe, where the superconducting phase is near (or coexists with) a ferromagnetic (FM) instability and spin-triplet electron pairing is driven by FM spin fluctuations. Here we use neutron scattering to show that, although UTe₂ exhibits no static magnetic order down to 0.3 K, its magnetism in the [0,K,L] plane is dominated by incommensurate spin fluctuations near an antiferromagnetic ordering wave vector and extends to at least 2.6 meV. We are able to understand the dominant incommensurate spin fluctuations of UTe₂ in terms of its electronic structure calculated using a combined density-functional and dynamic mean-field theory.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Rice Univ., Houston, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; SC0012311; FG02-04-ER46105; DMR-1810310; SC0018197; 89233218CNA000001

OSTI ID:: 1735405

Alternate ID(s):: OSTI ID: 1760601; OSTI ID: 1773812

Report Number(s):: LA-UR-20-24870; TRN: US2205214

Journal Information:: Physical Review Letters, Vol. 125, Issue 23; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Spin-singlet pairing
spin-triplet pairing
superconducting fluctuations

Title: Incommensurate Spin Fluctuations in the Spin-Triplet Superconductor Candidate UTe2

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Title: Incommensurate Spin Fluctuations in the Spin-Triplet Superconductor Candidate UTe₂