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Valence Instabilities in CeSn 3 and YbAl 3
Author(s) -
Buschow K. H. J.,
Goebel U.,
Dormann E.
Publication year - 1979
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220930219
Subject(s) - knight shift , valence (chemistry) , excited state , atmospheric temperature range , magnetic susceptibility , condensed matter physics , ground state , degeneracy (biology) , atomic physics , chemistry , range (aeronautics) , materials science , physics , thermodynamics , superconductivity , organic chemistry , bioinformatics , biology , composite material
The 27 Al NMR in YbAl 3 is studied by spin echo techniques in the temperature range 4.2 to 300 K. The temperature dependence of the Knight shift exhibits a minimum close to the temperature where the susceptibility shows a maximum. A comparison is made with NMR and susceptibility data of CeSn 3 . For CeSn 3 supplementary susceptibility measurements are made in the range 300 to 650 K. All data are analysed in terms of a two‐level model with a nonmagnetic ground state and excited state with a degeneracy of 2 J + 1. This excited state, corresponding to the 3+ integral valence state, largely determines the magnetic properties of these systems. The quadrupolar splitting of the 27 Al NMR in YbAl 3 is independent of temperature over the whole temperature range considered. Thus, it is concluded that the presumed change in valence of Yb with temperature does not involve major changes in charge distribution around the Yb atoms.