Non-Fermi Liquid Behavior in Dilute Quadrupolar System Prx_{x}La1−x_{1-x}Pb3_3 with xx≤\le0.05

We have studied the low-temperature properties of Pr$_{x}$La$_{1-x}$Pb$_{3}$ with non-Kramers $\Gamma_{3}$ quadrupolar moments of the crystal-electric-field ground state, for a wide concentration range of Pr ions. For $x$$\le$0.05, the specific heat $C/T$ increases monotonically below $T$=1.5 K, which can be scaled with a characteristic temperature $T^{*}$ defined at each concentration $x$. The electrical resistivity $\rho$$(T)$ in the corresponding temperature region shows a marked decrease deviating from a Fermi-liquid behavior $\rho$$(T)$$\propto$$T^{2}$. The Kondo effect arising from the correlation between the dilute $\Gamma_{3}$ moments and the conduction electrons may give rise to such anomalous behavior

Influence of the Direct Coulomb Interactions on the Resistivity in NdPb3\text{}_{3}

In order to investigate the influence of the 4f electrons on the scattering processes we measured resistivity of the NdPb$\text{}_{3}$ in the temperature range 7-300 K. As a result, we could compare the experimentally determined magnetic contribution to the resistivity with the theoretically calculated ones for the exchange and quadrupolar scattering. The results may confirm that the direct Coulomb interactions between 4f and conduction electrons predominate

High field magnetoresistance in antiferromagnetic monocrystalline PrSn3 and NdSn3

La magnétorésistance transverse des composés intermétalliques antiferromagnétiques PrSn3 et NdSn3 a été mesurée le long de l'axe [100] au-dessous de 4,2 K, dans des champs magnétiques jusqu'a 14 T. On a mis en évidence que la magnétorésistance est anisotrope pour PrSn3 et isotrope pour NdSn3. On a observé des maxima de la magnétorésistance en fonction de champ magnétique pour les deux composés. Les résultats ont été comparés avec des considérations théoriques de Yamada et Takada.The transversal magnetoresistance of antiferromagnetic lntermetallic PrSn3 and NdSn3 compounds was examined along [100] axis at temperatures lower than 4.2 K in the fields up to 14 T. The magnetoresistance was found to be anisotropic for PrSn3 and isotropic for NdSn3. However, for both compounds some maxima of the field dependence of the magnetoresistance were observed. The results have been discussed in terms of Yamada and Takada theoretical considerations

A Kondo-like thermoelectric power behaviour of UAsSe ferromagnet

We have investigated thermoelectric power of some uranium arsenochalcogenides (UAsS and UAs1-xSe1divided byx) and dipnictides (UP2, UP1.7As0.3 and UAs2) that crystallise in tetragonal structure and order ferro- and antiferro- magnetically, respectively. The thermoelectric power, S(T), is strongly anisotropic for all examined systems. While S(T) along c-axis displays a complex behaviour for all the compounds, a broad peak of S(T) along a-axis around 60 K has been observed only for the arsenochalcogenides. We ascribe it to be of a Kondo origin. A dependence of the peak behaviour on x is discussed in the frame of the multi-channel Kondo model. (C) 2002 Elsevier Science B.V. All rights reserved

High magnetic field properties of GdIn3

Both, the magnetisation and the magnetoresistivity of a GdIn3 single crystal have been investigated at 4.2 K in magnetic fields up to 40 T. The magnetisation shows an almost linear dependence on the applied field and reaches a value of only 3.4 µB/Gd-atom at the highest applied field strength. The magnetoresistance shows a saturation-type of dependence on the field. Both quantities investigated display a distinct anomaly at about 30 T in their field dependencies. A possible origin of this field-induced anomaly will be discussed