Resonant magnetic exciton mode in the heavy-fermion antiferromagnet CeB6

Abstract

Resonant magnetic excitations are widely recognized as hallmarks of unconventional superconductivity in copper oxides, iron pnictides, and heavy-fermion compounds. Numerous model calculations have related these modes to the microscopic properties of the pair wave function, but the mechanisms underlying their formation are still debated. Here we report the discovery of a similar resonant mode in the non-superconducting, antiferromagnetically ordered heavy-fermion metal CeB6. Unlike conventional magnons, the mode is non-dispersive, and its intensity is sharply concentrated around a wave vector separate from those characterizing the antiferromagnetic order. The magnetic intensity distribution rather suggests that the mode is associated with a coexisting order parameter of the unusual antiferro-quadrupolar phase of CeB6, which has long remained "hidden" to the neutron-scattering probes. The mode energy increases continuously below the onset temperature for antiferromagnetism, in parallel to the opening of a nearly isotropic spin gap throughout the Brillouin zone. These attributes bear strong similarity to those of the resonant modes observed in unconventional superconductors below their critical temperatures. This unexpected commonality between the two disparate ground states indicates the dominance of itinerant spin dynamics in the ordered low-temperature phases of CeB6 and throws new light on the interplay between antiferromagnetism, superconductivity, and "hidden" order parameters in correlated-electron materials.

References in corpus (9)

• Colloquium: Hidden Order, Superconductivity, and Magnetism -- The Unsolved Case of URu2Si2
• Spin resonance in the d-wave superconductor CeCoIn5
• Magnetically driven superconductivity in CeCu2Si2
• Spin dynamics in the pseudogap state of a high-temperature superconductor
• Neutron Scattering Resonance and the Fe-pnictide Superconducting Gap
• Feedback spin resonance in superconducting CeCu${}_2$Si${}_2$ and CeCoIn${}_5$
• Long-range order and low-energy magnetic excitations in CeRu2Al10
• Magnetic Excitations and their energy change available to Superconducting Condensation in Optimally Doped YBa${}_2$Cu${}_3$O${}_{6.95}$
• Spin Exciton Formation inside the Hidden Order Phase of CeB6

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• First-principles theory of magnetic multipoles in condensed matter systems
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• Fermi Surface Topology and Hotspots Distribution in Kondo Lattice System CeB6
• Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems
• Observation of a well-defined hybridization gap and in-gap states on the SmB6 (001) surface
• Revealing the nature of antiferro-quadrupolar ordering in Cerium Hexaboride: CeB${}_6$
• Multipole fluctuation theory for heavy fermion systems: Application to multipole orders in CeB6
• Chemical and valence reconstruction at the surface of SmB6 revealed with resonant soft x-ray reflectometry
• Nature of the spin resonance mode in CeCoIn${}_5$
• Critical theory of non-Fermi liquid fixed point in multipolar Kondo problem
• Collective infrared excitation in rare-earth Gd${}_x$La${}_{1-x}$B${}_6$ hexaborides
• Derivation of RKKY Interaction between Multipole Moments in CeB${}_6$ by the Effective Wannier Model based on the Bandstructure Calculation
• From Ising resonant fluctuations to static uniaxial order in antiferromagnetic and weakly superconducting CeCo(In${}_{1-x}$Hg${}_x$)${}_5$ ($x$=0.01)
• Field-angle resolved magnetic excitations as a probe of hidden-order symmetry in CeB6
• Doping-induced redistribution of magnetic spectral weight in substituted hexaborides Ce${}_{1-x}$La${}_x$B${}_6$ and Ce${}_{1-x}$Nd${}_x$B${}_6$
• The quartet ground state in CeB${}_6$: an inelastic x-ray scattering study
• Large positive correlation between the effective electron mass and the multipolar fluctuation in the heavy-fermion metal Ce${}_{1-x}$La${}_x$B${}_6$
• Incommensurate short-range multipolar order parameter of phase II in Ce3Pd20Si6
• Surface properties of SmB6 from x-ray photoelectron spectroscopy
• Momentum-space structure of quasielastic spin fluctuations in Ce3Pd20Si6
• Magnetic-field and doping dependence of low-energy spin fluctuations in the antiferroquadrupolar compound Ce(1-x)La(x)B(6)
• Magnetic field dependence of the neutron spin resonance in CeB6
• Evolution of the propagation vector of antiferroquadrupolar phases in Ce3Pd20Si6 with magnetic field
• Collective spin resonance excitation in the gapped itinerant multipole hidden order phase of URu2Si2
• f-electron charge densities probed using core level non-resonant inelastic x-ray scattering
• Hot-lines topology and the fate of the spin resonance mode in three-dimensional unconventional superconductors
• Two-orbital model for CeB${}_6$