TY  - JOUR
AU  - Alekseev, P.A.
AU  - Nemkovski, K.S.
AU  - Mignot, J.-M.
AU  - Lazukov, V.N.
AU  - Nikolov, A.A.
AU  - Menushenkov, A.P.
AU  - Yaroslavtsev, A.A.
AU  - Bewley, R.I.
AU  - Stewart, J.R.
AU  - Gribanov, A.V.
TI  - Magnetic Excitations in EuCu2(SixGe1-x)2: from mixed valence towards magnetism
JO  - Journal of physics / Condensed matter
VL  - 24
SN  - 0953-8984
CY  - Bristol
PB  - IOP Publ.
M1  - PreJuSER-22584
SP  - 375601
PY  - 2012
N1  - The work was supported by the RFBR grant No. 11-02-00121.
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
C6  - pmid:22914172
UR  - <Go to ISI:>//WOS:000308202700017
DO  - DOI:10.1088/0953-8984/24/37/375601
UR  - https://juser.fz-juelich.de/record/22584
ER  -