Abstract
It is found that chemical disorder in the YbInCu4 compound (especially in the Yb sublattice) considerably affects its magnetic properties due to spatial nonuniformity of the temperature TV of the first-order valence phase transition. The evolution of the magnetic susceptibility during disordering of the stoichiometric compound YbInCu4 is described by the model expression taking into account the TV dispersion upon the application of pressure and variation of composition of YbIn1−xAgxCu4 solid mixtures. The behavior of the main parameters of the system masked by blurring of the magnetic susceptibility singularity for a disordered sample during phase transition. Among other things, the value of the derivative dTV/dx=203 K is determined. The reason behind an abrupt change in the concentration dependence of dispersion and the paramagnetic Curie temperature is calculated at xc≃0.25.
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