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Here we present our experimental and theoretical study of the effects ofpressure on the transport properties of the heavy-fermion alloyCe(1-x)Yb(x)CoIn5 with x~0.07. We specifically choose this value of ytterbiumconcentration because the magnetic-field-induced quantum critical point, whichseparates the antiferromagnetic and paramagnetic states at zero temperature,approaches zero, as has been established in previous studies. Our measurementsshow that pressure further suppresses quantum fluctuations in this alloy, justas it does in the parent compound CeCoIn5. In contrast, the square-roottemperature dependent part of resistivity remains insensitive to pressure,indicating that the heavy-quasiparticles are not involved in the scatteringprocesses leading to such a temperature dependent resistivity. We demonstratethat the growth of the coherence temperature with pressure, as well as thedecrease of the residual resistivity, can be accurately described by employingthe coherent potential approximation for a disordered Kondo lattice.

Pressure studies of the quantum critical alloy Ce(0.93)Yb(0.07)CoIn5