Elsevier, Solid State Communications, 19(152), p. 1834-1837
DOI: 10.1016/j.ssc.2012.07.001
Full text: Unavailable
Measurements of the magnetization and specific heat of YbNi2 binary alloy are reported. The DC magnetic susceptibility displays a ferromagnetic behavior with a Curie temperature TC=10.5 K, one of the highest found in Yb compounds. Moreover, the temperature dependence of the specific heat exhibits a lambda anomaly with a peak of 5.12 J/mol K at 9.4 K. The analysis also shows an additional magnetic contribution around 32 K stemming from the crystalline electric field of a quartet at Δ 1 = 72 K and a doublet at Δ 2 = 126 K , according to the splitting of the Yb3+ ion in cubic symmetry. From the magnetic contribution to the specific heat, a relatively high Kondo temperature T K = 27 K is estimated. Below the magnetic transition, the specific heat shows a huge value of the electronic coefficient γ LT = 573 mJ / mol K , which is a signature of a heavy fermion behavior. Therefore, this alloy is a fine example of enhanced ferromagnetism and heavy fermion behavior among Yb compounds.