Ising incommensurate spin resonance of CeCoIn${}_5$: a dynamical precursor of the Q-phase

Abstract

It is shown by detailed inelastic neutron scattering experiments that the gapped collective magnetic excitation of the unconventional superconductor CeCoIn${}_5$, the spin resonance mode, is incommensurate and that the corresponding fluctuations are of Ising nature. The incommensurate peak position of these fluctuations corresponds to the propagation vector of the adjacent field induced static magnetic ordered phase, the so-called Q-phase. Furthermore, the direction of the magnetic moment fluctuations is also the direction of the ordered magnetic moments of the Q-phase. Hence the resonance mode and the Q-phase share the same symmetry and this strongly supports a scenario where the static order is realized by a condensation of the magnetic excitation.

Cited by in corpus (5)

• Robust Upward Dispersion of the Neutron Spin Resonance in the Heavy Fermion Superconductor Ce${}_{1-x}$Yb${}_x$CoIn${}_5$
• Spin Resonance and Magnetic Order in an Unconventional Superconductor
• Competing magnetic orders in the superconducting state of Nd-doped CeRhIn${}_5$ under pressure
• Tuning the pairing interaction in a $d$-wave superconductor by paramagnons injected through interfaces
• Anisotropic effect of a magnetic field on the neutron spin resonance in FeSe