Pressure dependence of the electrical resistivity ofYbCu4Ag

Pressure-dependent measurements of the electrical resistivity, ρ(T,ρ), of ${\mathrm{YbCu}}_4$Ag show a noticeable decrease of the resistivity maximum and a strong increase of the coefficient A in the ${\mathit{T}}^2$ term of ρ(T) when the pressure rises. This indicates that the Kondo temperature ${\mathit{T}}_{\mathit{K}}$ of this compound decreases with increasing pressure, stabilizing the 4${\mathit{f}}^{13}$ configuration of the Yb ion. In the scope of the compressible Kondo model, a value for the coupling constant times the electronic density of states at the Fermi energy has been deduced.