Magnetic field dependence of the neutron spin resonance in CeB $_{6}$

Portnichenko, P. Y.; Dukhnenko, A. V.; Shitsevalova, N. Yu.; Podlesnyak, A.; Schneidewind, A.; Semeno, A. V.; Friemel, G.; Jang, H.; Cameron, A. S.; Ollivier, J.; Inosov, D. S.; Filipov, V. B.; Ohta, H.; Demishev, S. V.; Surmach, M. A.

doi:10.1103/PhysRevB.94.035114

Journal Article

FZJ-2016-03738

Magnetic field dependence of the neutron spin resonance in CeB $_{6}$

Portnichenko, P. Y. ; Demishev, S. V. ; Semeno, A. V. ; Ohta, H. ; Cameron, A. S. ; Surmach, M. A. ; Jang, H. ; Friemel, G. ; Dukhnenko, A. V. ; Shitsevalova, N. Y. ; Filipov, V. B. ; Schneidewind, A.FZJ* ; Ollivier, J. ; Podlesnyak, A. ; Inosov, D. S. (Corresponding author)

2016
APS College Park, Md.

Physical review / B 94(3), 035114 (2016) [10.1103/PhysRevB.94.035114]

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Please use a persistent id in citations: http://hdl.handle.net/2128/12283 doi:10.1103/PhysRevB.94.035114

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 nonsuperconducting CeB6. A 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 nonmonotonic 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.

Keyword(s): Basic research (1st) ; Magnetism (2nd) ; Condensed Matter Physics (2nd)

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