Nature of the spin resonance mode in CeCoIn${}_5$

Abstract

Spin-fluctuation-mediated unconventional superconductivity can emerge at the border of magnetism, featuring a superconducting order parameter that changes sign in momentum space. Detection of such a sign-change is experimentally challenging, since most probes are not phase-sensitive. The observation of a spin resonance mode (SRM) from inelastic neutron scattering is often seen as strong phase-sensitive evidence for a sign-changing superconducting order parameter, by assuming the SRM is a spin-excitonic bound state. Here, we show that for the heavy fermion superconductor CeCoIn${}_5$, its SRM defies expectations for a spin-excitonic bound state, and is not a manifestation of sign-changing superconductivity. Instead, the SRM in CeCoIn${}_5$ likely arises from a reduction of damping to a magnon-like mode in the superconducting state, due to its proximity to magnetic quantum criticality. Our findings emphasize the need for more stringent tests of whether SRMs are spin-excitonic, when using their presence to evidence sign-changing superconductivity.

arXiv commentaccepted for publication in Communications Physics

References in corpus (52)

• A Common Thread: the pairing interaction for the unconventional superconductors
• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Quantum Magnetic Excitations from Stripes in Copper-Oxide Superconductors
• Resonant Spin Excitation in the High Temperature Superconductor Ba0.6K0.4Fe2As2
• Angular Position of Nodes in the Superconducting Gap of Quasi-2D Heavy-Fermion Superconductor CeCoIn_5
• The Challenge of Unconventional Superconductivity
• The effect of collective spin-1 excitations on electronic spectra in high-Tc superconductors
• Evolution of the resonance and incommensurate spin fluctuations in superconducting YBa${}_2$Cu${}_3$O${}_{6+x}$
• Spin resonance in the d-wave superconductor CeCoIn5
• Unconventional Superconductivity
• Magnetically driven superconductivity in CeCu2Si2
• The Spin Excitation Spectrum in Superconducting $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6.85}$
• Spin dynamics in the pseudogap state of a high-temperature superconductor
• In-plane anisotropy of spin excitations in the normal and superconducting states of underdoped YBa${}_2$Cu${}_3$O${}_{6+x}$
• Progress in Neutron Scattering Studies of Spin Excitations in High-Tc Cuprates
• Imaging Cooper Pairing of Heavy Fermions in CeCoIn5
• Visualizing Nodal Heavy Fermion Superconductivity in CeCoIn5
• Novel neutron resonance mode in $d_{x^2-y^2}$ superconductors
• Structure of Neutron-Scattering Peak in both s++ wave and s+- wave states of an Iron pnictide Superconductor
• The resonance peak in cuprate superconductors
• Resonant magnetic excitations at high energy in superconducting $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6.85}$
• Testing the itinerancy of spin dynamics in superconducting Bi2212
• Feedback spin resonance in superconducting CeCu${}_2$Si${}_2$ and CeCoIn${}_5$
• Magnetic structure of Cd-doped CeCoIn5
• Commensurate antiferromagnetic excitations as a signature of the pseudogap in the tetragonal high-Tc cuprate HgBa${}_2$CuO${}_{4+\delta }$
• Fully gapped superconductivity with no sign change in the prototypical heavy-fermion CeCu2Si2
• Dispersion of Magnetic Excitations in Superconducting Optimally Doped YBa_2Cu_3O_6.95
• Fully gapped $d$-wave superconductivity in CeCu${}_2$Si${}_2$
• Resonant magnetic exciton mode in the heavy-fermion antiferromagnet CeB6
• Magnetic field splitting of the spin-resonance in CeCoIn5
• Switching of magnetic domains reveals evidence for spatially inhomogeneous superconductivity
• Direct Evidence for a Magnetic f-electron Mediated Cooper Pairing Mechanism of Heavy Fermion Superconductivity in CeCoIn5
• Full-gap superconductivity robust against disorder in heavy-fermion CeCu2Si2
• The magnitude of the magnetic exchange interaction in the heavy fermion antiferromagnet CeRhIn${}_5$
• Field-Induced Spin-Exciton Condensation in dx2-y2-wave Superconducting CeCoIn5
• Robust Upward Dispersion of the Neutron Spin Resonance in the Heavy Fermion Superconductor Ce${}_{1-x}$Yb${}_x$CoIn${}_5$
• The resonance peak in the electron-doped cuprate superconductors
• Hourglass dispersion and resonance of magnetic excitations in the superconducting state of the single-layer cuprate HgBa2CuO4+δ near optimal doping
• Gap symmetry of the heavy fermion superconductor CeCu${}_2$Si${}_2$ at ambient pressure
• Magnetic order in Ce0.95Nd0.05CoIn5: the Q-phase at zero magnetic field
• Single to multi quasiparticle excitations in the itinerant helical magnet CeRhIn${}_5$
• Magnonlike dispersion of spin resonance in Ni-doped BaFe${}_2$As${}_2$
• Tunable Emergent Heterostructures in a Prototypical Correlated Metal
• Magnetic fluctuations in n-type high-$T_c$ superconductors reveal breakdown of fermiology
• From Ising resonant fluctuations to static uniaxial order in antiferromagnetic and weakly superconducting CeCo(In${}_{1-x}$Hg${}_x$)${}_5$ ($x$=0.01)
• Change of Antiferromagnetic Structure near a Quantum Critical Point in CeRh1-xCoxIn5
• Theory of nodal s+- wave pairing symmetry in the Pu-based 115 superconductor family
• Field induced spin exciton doublet splitting in d_{x^2-y^2}-wave 115-heavy electron superconductors
• Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba${}_{0.67}$K${}_{0.33}$(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Plaquette instability competing with bicollinear ground state in detwinned FeTe
• Universal Heat Conduction in Ce1-xYbxCoIn5: Evidence for Robust Nodal d-wave Superconducting Gap
• Spin-isotropic continuum of spin excitations in antiferromagnetically ordered Fe${}_{1.07}$Te

Cited by in corpus (11)

• Incommensurate Spin Fluctuations in the Spin-triplet Superconductor Candidate UTe${}_2$
• Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe${}_2$
• Neutron spin resonance in a quasi-two-dimensional iron-based superconductor
• Theory of magnetic excitations in multilayer nickelate superconductor La${}_3$Ni${}_2$O${}_7$
• Feedback of superconductivity on the magnetic excitation spectrum of UTe${}_2$
• Unconventional fully-gapped superconductivity in the heavy-fermion metal CeCu${}_2$Si${}_2$
• High-energy magnetic excitations from heavy quasiparticles in CeCu${}_2$Si${}_2$
• A new inelastic neutron spectrometer HODACA
• Hybridization-Controlled Pseudogap State in the Quantum Critical Superconductor CeCoIn5
• Anisotropic excitonic magnetism from discrete ${\mathrm{C}}_4$ symmetry in CeRhIn${}_5$
• Hot-lines topology and the fate of the spin resonance mode in three-dimensional unconventional superconductors