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Elsevier, Solid State Communications, 19(152), p. 1834-1837

DOI: 10.1016/j.ssc.2012.07.001

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YbNi2: A heavy fermion ferromagnet

This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Data provided by SHERPA/RoMEO

Abstract

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.