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J. Custers, S. Gottlieb-Schönemeyer, H. Michor, G. Hilscher, W. Assmus, S. Paschen:
"Physical properties of the complex binary alloys YbCu_4.4 and ErCu_4.13";
Journal of Physics: Conference Series, 150 (2009), 042021-1 - 042021-4.

Up to now the only the physical properties of polycrystals of the series RECux (RE = Rare Earth, x ~ 4.0) have been investigated. Here, we present first results on a single crystal of YbCu4.4. The magnetization of YbCu4.4 has been measured with B parallel c-axis and B ⊥ c-axis. For both orientations, the susceptibility follows a Curie-Weiss law down to about 30 K revealing a Weiss temperature of Θ = -24 K (μeff = 4.39μB) and Θ = -54 K (μeff = 4.39μb) for B ⊥ c and B parallel c, respectively. The resistivity of YbCu4.4 increases with decreasing temperature from 300K and exhibits a Kondo maximum around 15K. No magnetic ordering is observed. In addition, we succeeded to produce a single phase ErCu4.13 polycrystal. ErCu4.13 is of similar structure as the Yb-phase. Magnetization and specific heats measurements clearly show multiple phase transitions at T approx 4.3 K and T approx 3.3 K. The later transition might be attributed to Er2O3.

http://dx.doi.org/10.1088/1742-6596/150/4/042021

http://dx.doi.org/10.1088/1742-6596/150/4/042021