Robust Upward Dispersion of the Neutron Spin Resonance in the Heavy Fermion Superconductor Ce${}_{1-x}$Yb${}_x$CoIn${}_5$

Abstract

The neutron spin resonance is a collective magnetic excitation that appears in copper oxide, iron pnictide, and heavy fermion unconventional superconductors. Although the resonance is commonly associated with a spin-exciton due to the $d$($s^{\pm }$)-wave symmetry of the superconducting order parameter, it has also been proposed to be a magnon-like excitation appearing in the superconducting state. Here we use inelastic neutron scattering to demonstrate that the resonance in the heavy fermion superconductor Ce${}_{1-x}$Yb${}_x$CoIn${}_5$ with $x=0,0.05,0.3$ has a ring-like upward dispersion that is robust against Yb-doping. By comparing our experimental data with random phase approximation calculation using the electronic structure and the momentum dependence of the $d_{x^2-y^2}$-wave superconducting gap determined from scanning tunneling microscopy for CeCoIn${}_5$, we conclude the robust upward dispersing resonance mode in Ce${}_{1-x}$Yb${}_x$CoIn${}_5$ is inconsistent with the downward dispersion predicted within the spin-exciton scenario.

Supplementary Information available upon request

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Cited by in corpus (12)

• Unconventional Superconductivity
• Neutron spin resonance in a quasi-two-dimensional iron-based superconductor
• Feedback of superconductivity on the magnetic excitation spectrum of UTe${}_2$
• Nature of the spin resonance mode in CeCoIn${}_5$
• Neutron Spin Resonance in the Heavily Hole-doped KFe${}_2$As${}_2$ Superconductor
• Observation of a neutron spin resonance in the bilayered superconductor CsCa2Fe4As4F2
• Relaxing Kondo screened Kramers-doublets in CeRhSi${}_3$
• Spectroscopic Evidence for the Direct Involvement of Local Moments in the Pairing Process of the Heavy-Fermion Superconductor CeCoIn${}_5$
• Orbital selective neutron spin resonance in underdoped superconducting NaFe${}_{\text{0.985}}$Co${}_{\text{0.015}}$As
• Observation of a new field-induced phase transition and its concomitant quantum critical fluctuations in CeCo(In${}_{1-x}$Zn${}_x$)${}_5$
• Temperature and polarization dependence of low-energy magnetic fluctuations in nearly-optimal-doped NaFe${}_{0.9785}$Co${}_{0.0215}$As
• Anisotropic magnetic-field response of quantum critical fluctuations in Ni-doped CeCoIn5