Abstract
We have investigated the electrical resistivity ρ, specific heat Cp and Hall coefficient RH on a single crystal of a ferromagnetic Kondo lattice UCu0.9Sb2. The experimental , Cp(T) and data evidence a bulk magnetic phase transition at K, and additionally exhibit an unexpected bump located in the temperature range TC/10–TC/3. UCu0.9Sb2 has an enhanced electronic specific heat coefficient mJ molK−2, corresponding to Kondo temperature K. An analysis of the Hall effect data for j//(a, b)-plane and H// c-axis reveals that the low-temperature ordinary Hall coefficient R0 is positive, suggesting that p-type electrical conductivity is dominant. The density of the carriers at 2 K is about 0.6 holes f.u.−1, which may categorize the studied compound into class of low carrier density compounds. Combined γ and R0 data divulge an effective mass of charge carriers 27 me. This finding together with quite low Hall mobility cm2 Vs−1 and Kadowaki–Woods ratio cm (mol K2 mJ−1)2, manifest the development of heavy-fermion state in the ferromagnetic UCu0.9Sb2 compound at low temperatures.
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