Magnetic Susceptibility of YbCuGa, YbAgGa and YbAuGa Compounds
The rare earth ions normally exist in a trivalent state in most of their alloys and compounds. However, Ce, Sm, Eu, Tm and Yb are exceptions and can exist in other than the trivalent state. Thus cerium can have a valency of four and Sm, Eu, Tm and Yb a valency of two. The valence adopted by these rare earth ions in an alloy or a compound is a function of several factors such as nature of other alloying elements, temperature, pressure etc. In some systems, there may be a rapid fluctuation between the two valence states. Such systems are characterized  by the anomalies in the unit cell volume, maxima in the susceptibility, large electronic specific heat coefficient, two sets of lines in the XPS spectra corresponding to two different initial state configurations of the rare earth ion etc.
KeywordsMagnetic Susceptibility Unit Cell Volume Trivalent State Divalent State Ground State Configuration
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