TY - JOUR
T1 - Incommensurate Spin Fluctuations in the Spin-Triplet Superconductor Candidate UTe2
AU - Duan, Chunruo
AU - Sasmal, Kalyan
AU - Maple, M. Brian
AU - Podlesnyak, Andrey
AU - Zhu, Jian Xin
AU - Si, Qimiao
AU - Dai, Pengcheng
N1 - Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/12/1
Y1 - 2020/12/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85097561190&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.125.237003
DO - 10.1103/PhysRevLett.125.237003
M3 - Article
C2 - 33337176
AN - SCOPUS:85097561190
SN - 0031-9007
VL - 125
JO - Physical Review Letters
JF - Physical Review Letters
IS - 23
M1 - 237003
ER -