Low temperature hall effect and thermopower of YbCu4Au and YbCu4Pd

Magnetic, transport, and thermal properties ofYb2T3X9Trovarelli1, Geibel2, Buschinger3 et al. 1999Phys. Rev. B341270View full textAdd to dashboardCite

“…5, 6, and 7͒ show a striking similarity to those of YbCu 4 Au and YbCu 4 Pd. 20,31,32 The latter compounds are described as magnetic KL systems with transition temperatures T N Ͻ1 K, 33 Kondo temperatures T K Ӎ0.5 K, 34 and low-lying CEF excited levels separated by an energy ⌬ CEF Ӎ45 K from the GS doublet. 34 We propose that in the case of Yb 2 Rh 3 Al 9 and Yb 2 Ir 3 Al 9 the respective hightemperature maxima in (T) and minima in TEP are due to the interaction of Kondo-type incoherent scattering on lowlying CEF levels situated at ⌬ CEF Ӎ30 K. This is supported by the features observed in the transport properties, where Kondo-type correlations are responsible for the enhanced logarithmic increase of (T) and the enhanced negative values of TEP ͑cf.…”