Strong electronic correlations in a new class of Yb-based compounds: YbXCu4(X=Ag,Au,Pd)

Crossover between Fermi liquid and non-Fermi liquid behavior in the non-centrosymmetric compound Yb2Ni12P7

“…[35,36] From these fits, we find that ρ 0 ∼ 15.8 µΩ cm and 16.3 µΩ cm and that A = 0.0458 µΩ cm/K 2 and 0.0462 µΩ cm/K 2 for µ 0 H = 0 T and 9 T, respectively. These results suggest that applied magnetic fields less than µ 0 H = 9 T have a negligible effect on the FL ground state.…”

On the existence of heavy fermion ytterbium compounds

“…This is illustrated in Fig. 1, in which are shown p vs. temperature T data for YbXCu4 compounds with X=Pd, Au and Ag [13]. The maxima at 1.1 K for X=Au and at 0.7 K for X=Pd are associated with freezing-out of magnetic scattering due to the onset of magnetic order.…”

“…There are a number of instances reported in intermetallic compounds, however [5] where good evidence for Kondo-type interactions is found. This is seen in the electrical resistivity p of such materials as YbAgCu4 [13] and YbNiSn [14], for example. This is illustrated in Fig.…”

“…The two materials YbCuA1 [171 and YbAgCu4 [13] with T~250 mJ (mol Yb)-i K-2 are well documented to be mixed valence compounds. Shown in Curie-Weiss law between room temperature and about 100 K and then pass through a maximum at about 35 K before reaching a constant value at low temperature [ 13 ].…”

“…Shown in Curie-Weiss law between room temperature and about 100 K and then pass through a maximum at about 35 K before reaching a constant value at low temperature [ 13 ]. This behavior of x(T) is similar to that reported for YbCuA1 The range 100 _< ~/~< 300 mJ (mol Yb) -1 K -2 is one where many compounds are found, most of which order magnetically, often with an integrated entropy to the magnetic ordering temperature less than Rln2 (mol Yb)-i (see Table 1).…”