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Pressure dependence of the electrical resistivity of the filled skutterudites LnFe4Sb12 (Ln = Ce, Yb)

We report the pressure dependence of the electrical resistivity of two filled skutterudite compounds YbFe4 Sb12 and CeFe4 Sb12 from 1.2 K up to room temperature and under applied pressures up to 17 kbar. Both YbFe4 Sb12 and CeFe4 Sb12 show a rapid decrease of at ~50 K and ~100 K, respectively, which is caused by the onset of coherent scattering of electrons from the rare-earth sublattice. The resistivity curves can be collapsed onto the ambient pressure curve using a single scaling temperature T 0 , indicating that a single characteristic energy dominates the transport properties. For CeFe4 Sb12 , T 0 is found to increase with pressure, while the opposite behaviour is observed for YbFe4 Sb12 . The pressure dependence of as well as the change of T 0 are similar to the findings for a number of other intermediate-valence and heavy-fermion systems.