Resonant magnetic exciton mode in the heavy-fermion antiferromagnet CeB₆.

Nature Communications
G FriemelD S Inosov

Abstract

Resonant magnetic excitations are recognised as hallmarks of unconventional superconductivity in copper oxides, iron pnictides and heavy-fermion compounds. Model calculations have related these modes to the microscopic properties of the pair wave function, but the mechanisms of their formation are still debated. Here we report the discovery of a similar resonant mode in the non-superconducting antiferromagnetic heavy-fermion metal CeB(6). Unlike conventional magnons, the mode is non-dispersive and is sharply peaked around a wave vector separate from those characterising the antiferromagnetic order. It is likely associated with a co-existing order parameter of the unusual antiferro-quadrupolar phase of CeB(6), which has long remained hidden to 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 are similar to those of the resonant modes in unconventional superconductors. This unexpected commonality between the two disparate ground states indicates the dominance of itinerant spin dynamics in the ordered low-temperature phases of CeB(6) and throws new light on t...Continue Reading

References

Mar 21, 2008·Physical Review Letters·C StockC Petrovic
Oct 15, 2008·Physical Review Letters·A V Chubukov, L P Gor'kov
Nov 13, 2008·Physical Review Letters·I EreminP Fulde
Aug 8, 2009·Physical Review Letters·Takeshi MatsumuraFumitoshi Iga
May 1, 2012·Physical Review Letters·Alireza Akbari, Peter Thalmeier

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Citations

Mar 16, 2016·Nature Communications·A KoitzschD S Inosov
Dec 17, 2016·Scientific Reports·A V SemenoS V Demishev
May 14, 2016·Reports on Progress in Physics·Alistair S CameronDmytro S Inosov
Mar 9, 2019·Physical Review Letters·C K BarmanAftab Alam
Jul 22, 2020·Nature·Soonmin KangJe-Geun Park
Jan 1, 2020·Communications Physics·Yu SongPengcheng Dai

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