Electron spin resonance of the Yb 4f-moment in Yb(Rh sub(1-x)Fe sub(x)) sub(2)Si sub(2)

The electron spin resonance (ESR) signal of the heavy-fermion metal YbRh sub(2)Si sub(2) is investigated in terms of its dependence on the partial substitution of Rh by Fe. This non-isovalent substitution gives rise to a chemical pressure and also leads to a reduction of the conduction electron dens...

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Bibliographic Details
Published in:Physica Status Solidi. B: Basic Solid State Physics 2013-03, Vol.250 (3), p.495-497
Main Authors: Sichelschmidt, J, Jeevan, H S, Mchalwat, M, Gegenwart, P
Format: Article
Language:English
Subjects:
Crystals
Electron paramagnetic resonance
Electron spin resonance
Fermions
Iron
Lead (metal)
Solid state physics
Spectra
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Summary:The electron spin resonance (ESR) signal of the heavy-fermion metal YbRh sub(2)Si sub(2) is investigated in terms of its dependence on the partial substitution of Rh by Fe. This non-isovalent substitution gives rise to a chemical pressure and also leads to a reduction of the conduction electron density of states (hole doping). The values and anisotropy of the ESR parameters are comparable with those of Yb(Rh sub(1-x) Co sub(x)) sub(2)Si sub(2) for Fe-contents up to at least 10%. This result provides additional evidence that the Kondo interaction allows narrow ESR spectra in a heavy fermion compound. The absence of an ESR signal for 30% Fe content points towards a distribution of different crystal electric field symmetries at the Yb-sites, leading to a dominating disorder-related broadening.
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.201200752