Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe${}_2$

Abstract

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 fluctuations, uranium based materials near an FM instability are considered to be ideal candidates for realizing spin-triplet superconductivity. Indeed, UTe${}_2$, which has a $T_c\approx 1.6$ 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 UTe${}_2$ 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 UTe${}_2$ suggests that AF spin fluctuations may also induce spin-triplet pairing or that electron pairing in UTe${}_2$ has a spin-singlet component.

30 pages, 4 figures in main text and 7 figures in extended data

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Cited by in corpus (43)

• Unconventional Superconductivity in UTe2
• Detection of a Pair Density Wave State in UTe${}_2$
• Single-component superconducting state in UTe2 at 2 K
• Field-induced tuning of the pairing state in a superconductor
• Chiral superconductivity in UTe2 probed by anisotropic low-energy excitations
• $c$-axis transport in UTe${}_2$: Evidence of Three Dimensional Conductivity Component
• A review of UTe${}_2$ at high magnetic fields
• Symmetry of magnetic correlations in spin-triplet superconductor UTe2
• Effect of uranium deficiency on normal and superconducting properties in unconventional superconductor UTe${}_2$
• Enhanced triplet superconductivity in next generation ultraclean UTe2
• Quantum-geometry-induced anapole superconductivity
• Unconventional fully-gapped superconductivity in the heavy-fermion metal CeCu${}_2$Si${}_2$
• Ubiquitous Spin Freezing in the Superconducting State of UTe2
• Spin triplet superconductivity driven by finite momentum spin fluctuations
• Nonreciprocal Meissner response in parity-mixed superconductors
• Anisotropic signatures of the electronic correlations in the electrical resistivity of UTe${}_2$
• Multiple superconducting phases in heavy-fermion metals
• Inhomogeneous high temperature melting and decoupling of charge density waves in spin-triplet superconductor UTe2
• Anisotropic Enhancement of Lower Critical Field in Ultraclean Crystals of Spin-Triplet Superconductor UTe2
• Robust and tunable coreless vortices and fractional vortices in chiral $d$-wave superconductors
• c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure
• A quantum critical line bounds the high field metamagnetic transition surface in UTe${}_2$
• Incommensurate antiferromagnetism in UTe2 under pressure
• Absence of a bulk charge density wave signature in x-ray measurements of UTe${}_2$
• Quasi-uniaxial pressure induced superconductivity in stoichiometric compound UTe${}_2$
• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$
• Enhanced chiral edge currents and orbital magnetic moment in chiral $d$-wave superconductors from mesoscopic finite-size effects
• Unconventional $s$-Wave Pairing with Point-Node-Like Gap Structure in UTe${}_2$
• Nodal superconducting gap structure and topological surface states of UTe${}_2$
• ${\mu }^{+}$ Knight Shift in UTe${}_2$: Evidence for Relocalization in a Kondo Lattice
• Observation of Persistent Zero Modes and Superconducting Vortex Doublets in UTe${}_2$
• Nematic superconductivity from selective orbital pairing in Ba(Fe1-xMx)2As2 (M = Co, Ni) single crystals
• Topological states in strongly correlated systems
• Dramatic elastic response at the critical end point in UTe${}_2$
• Emergent ferromagnetic ladder excitations in heavy fermion superconductor CeSb${}_2$
• Metamagnetism in the high-pressure tetragonal phase of UTe${}_2$
• Magnetic fluctuations and anisotropy in UTe2: a multi-orbital study based on GGA+U and RPA
• Nature of quantum criticality in the Ising ferromagnet TbV${}_6$Sn${}_6$
• Designing edge currents using mesoscopic patterning in chiral d-wave superconductors
• Theoretical Study of Impurity Effects on Superconductivity in UTe2
• Spin-lattice relaxation for point-node-like s-wave superconductivity in f-electron systems
• Electronic structure of UTe${}_2$ under pressure
• Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T