Slow-charge-carrier electronic transport in the heavy-fermion YbCu4.25 complex intermetallic

We present an analytical model of the temperature-dependent electrical resistivity ρ(T) and the thermoelectric power S(T) of heavy-fermion systems that reproduce the maximum in ρ(T) and the minimum in S(T). The model is based on the quantum transport theory of slow charge carriers, where the velocity of heavy electrons is low due to their large effective mass m∗. The theory is applied to the experimental ρ(T) and S(T) data of the recently discovered heavy-fermion system YbCu4.25, belonging to the class of giant-unit-cell complex metallic alloys.