Magnetic field dependence of the neutron spin resonance in CeB6

Abstract

In zero magnetic field, the famous neutron spin resonance in the f-electron superconductor CeCoIn5 is similar to the recently discovered exciton peak in the non-superconducting CeB6. Magnetic field splits the resonance in CeCoIn5 into two components, indicating that it is a doublet. Here we employ inelastic neutron scattering (INS) to scrutinize the field dependence of spin fluctuations in CeB6. The exciton shows a markedly different behavior without any field splitting. Instead, we observe a second field-induced magnon whose energy increases with field. At the ferromagnetic zone center, however, we find only a single mode with a non-monotonic field dependence. At low fields, it is initially suppressed to zero together with the antiferromagnetic order parameter, but then reappears at higher fields inside the hidden-order phase, following the energy of an electron spin resonance (ESR). This is a unique example of a ferromagnetic resonance in a heavy-fermion metal seen by both ESR and INS consistently over a broad range of magnetic fields.

arXiv comment7 pages, 6 figures including one animation, accepted to Phys. Rev. B

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Cited by in corpus (5)

• Raman spectroscopy of $f$-electron metals: an example of CeB${}_6$
• Field-angle resolved magnetic excitations as a probe of hidden-order symmetry in CeB6
• The quartet ground state in CeB${}_6$: an inelastic x-ray scattering study
• Evolution of the propagation vector of antiferroquadrupolar phases in Ce3Pd20Si6 with magnetic field
• f-electron charge densities probed using core level non-resonant inelastic x-ray scattering