Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe2
Abstract
We report superconductivity originates from the formation of bound (Cooper) pairs of electrons that can move through the lattice without resistance below the superconducting transition temperature $$T_c$$. Electron Cooper pairs in most superconductors form anti-parallel spin singlets with total spin S = 0, although they can also form parallel spin-triplet Cooper pairs with S = 1 and an odd parity wavefunction. Spin-triplet pairing is important because it can host topological states and Majorana fermions relevant for quantum computation. Because spin-triplet pairing is usually mediated by ferromagnetic (FM) spin fluctuations3, uranium-based materials near an FM instability are considered to be ideal candidates for realizing spin-triplet superconductivity. Indeed, UTe2, which has a $$T_c$$ ≈ 1.6 K, has been identified as a candidate for a chiral spin-triplet topological superconductor near an FM instability, although it also has antiferromagnetic (AF) spin fluctuations. Here we use inelastic neutron scattering (INS) to show that superconductivity in UTe2 is coupled to a sharp magnetic excitation, termed resonance, at the Brillouin zone boundary near AF order. Because the resonance has only been found in spin-singlet unconventional superconductors near an AF instability, its observation in UTe2 suggests that AF spin fluctuations may also induce spin-triplet pairing or that electron pairing in UTe2 has a spin-singlet component.
- Authors:
-
[3];
[1];
[1]
- Rice Univ., Houston, TX (United States)
- Florida State Univ., Tallahassee, FL (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of California, San Diego, CA (United States)
- Arizona State Univ., Tempe, AZ (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Robert A. Welch Foundation; National Science Foundation (NSF)
- OSTI Identifier:
- 1855660
- Grant/Contract Number:
- AC05-00OR22725; SC0012311; C-1839; C-1411; DMR-1644779; SC0016568; FG02-04-ER46105; DMR-1810310; SC0018197; PHY-1607611
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature (London)
- Additional Journal Information:
- Journal Name: Nature (London); Journal Volume: 600; Journal Issue: 7890; Journal ID: ISSN 0028-0836
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; magnetic properties; magnetic materials; superconducting properties; superconducting materials
Citation Formats
Duan, Chunruo, Baumbach, R. E., Podlesnyak, Andrey A., Deng, Yuhang, Moir, Camilla, Breindel, Alexander J., Maple, M. Brian, Nica, E. M., Si, Qimiao, and Dai, Pengcheng. Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe2. United States: N. p., 2021.
Web. doi:10.1038/s41586-021-04151-5.
Duan, Chunruo, Baumbach, R. E., Podlesnyak, Andrey A., Deng, Yuhang, Moir, Camilla, Breindel, Alexander J., Maple, M. Brian, Nica, E. M., Si, Qimiao, & Dai, Pengcheng. Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe2. United States. https://doi.org/10.1038/s41586-021-04151-5
Duan, Chunruo, Baumbach, R. E., Podlesnyak, Andrey A., Deng, Yuhang, Moir, Camilla, Breindel, Alexander J., Maple, M. Brian, Nica, E. M., Si, Qimiao, and Dai, Pengcheng. Wed .
"Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe2". United States. https://doi.org/10.1038/s41586-021-04151-5. https://www.osti.gov/servlets/purl/1855660.
@article{osti_1855660,
title = {Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe2},
author = {Duan, Chunruo and Baumbach, R. E. and Podlesnyak, Andrey A. and Deng, Yuhang and Moir, Camilla and Breindel, Alexander J. and Maple, M. Brian and Nica, E. M. and Si, Qimiao and Dai, Pengcheng},
abstractNote = {We report superconductivity originates from the formation of bound (Cooper) pairs of electrons that can move through the lattice without resistance below the superconducting transition temperature $T_c$. Electron Cooper pairs in most superconductors form anti-parallel spin singlets with total spin S = 0, although they can also form parallel spin-triplet Cooper pairs with S = 1 and an odd parity wavefunction. Spin-triplet pairing is important because it can host topological states and Majorana fermions relevant for quantum computation. Because spin-triplet pairing is usually mediated by ferromagnetic (FM) spin fluctuations3, uranium-based materials near an FM instability are considered to be ideal candidates for realizing spin-triplet superconductivity. Indeed, UTe2, which has a $T_c$ ≈ 1.6 K, has been identified as a candidate for a chiral spin-triplet topological superconductor near an FM instability, although it also has antiferromagnetic (AF) spin fluctuations. Here we use inelastic neutron scattering (INS) to show that superconductivity in UTe2 is coupled to a sharp magnetic excitation, termed resonance, at the Brillouin zone boundary near AF order. Because the resonance has only been found in spin-singlet unconventional superconductors near an AF instability, its observation in UTe2 suggests that AF spin fluctuations may also induce spin-triplet pairing or that electron pairing in UTe2 has a spin-singlet component.},
doi = {10.1038/s41586-021-04151-5},
journal = {Nature (London)},
number = 7890,
volume = 600,
place = {United States},
year = {Wed Dec 22 00:00:00 EST 2021},
month = {Wed Dec 22 00:00:00 EST 2021}
}
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