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| Home > Publications database > Magnetic Excitations in EuCu2(SixGe1-x)2: from mixed valence towards magnetism |
| Journal Article | PreJuSER-22584 |
; ; ; ; ; ; ; ; ;
2012
IOP Publ.
Bristol
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Please use a persistent id in citations: doi:10.1088/0953-8984/24/37/375601
Abstract: We report the inelastic neutron scattering study of spin dynamics in EuCu(2)(Si(x)Ge(1-x))(2) (x = 1, 0.9, 0.75, 0.6), performed in a wide temperature range. At x = 1 the magnetic excitation spectrum was found to be represented by the double-peak structure well below the energy range of the Eu(3+) spin-orbit (SO) excitation (7)F(0)→(7)F(1), so that at least the high-energy spectral component can be assigned to the renormalized SO transition. Change of the Eu valence towards 2 + with increased temperature and/or Ge concentration results in further renormalization (lowering the energy) and gradual suppression of both inelastic peaks in the spectrum, along with developing sizeable quasielastic signal. The origin of the spectral structure and its evolution is discussed in terms of excitonic model for the mixed valence state.
Keyword(s): Basic research (1st) ; Others (1st) ; Magnetism (2nd) ; J
; Current Contents - Social and Behavioral Sciences ; JCR ; Nationallizenz
; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection
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