This title appears in the Scientific Report :
2012
Please use the identifier:
http://dx.doi.org/10.1088/0953-8984/24/37/375601 in citations.
Magnetic Excitations in EuCu2(SixGe1-x)2: from mixed valence towards magnetism
Magnetic Excitations in EuCu2(SixGe1-x)2: from mixed valence towards magnetism
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+) s...
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Personal Name(s): | Alekseev, P.A. |
---|---|
Nemkovski, K.S. / Mignot, J.-M. / Lazukov, V.N. / Nikolov, A.A. / Menushenkov, A.P. / Yaroslavtsev, A.A. / Bewley, R.I. / Stewart, J.R. / Gribanov, A.V. | |
Contributing Institute: |
Streumethoden; PGI-4 Streumethoden; JCNS-2 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Journal of physics / Condensed matter, 24 (2012) S. 375601 |
Imprint: |
Bristol
IOP Publ.
2012
|
Physical Description: |
375601 |
PubMed ID: |
22914172 |
DOI: |
10.1088/0953-8984/24/37/375601 |
Document Type: |
Journal Article |
Research Program: |
In-house Research with PNI Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Journal of Physics: Condensed Matter
24 |
Subject (ZB): | |
Publikationsportal JuSER |
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. |