Low-temperature properties of the Yb-based heavy-fermion antiferromagnets YbPtIn, YbRhSn, and YbNiGa

Antiferromagnetic Kondo lattice behaviour of YbNiAl2 alloy

“…In this sense, YbNiAl was characterized as a heavy-fermion ( = 350 mJ/mol K 2 ) with antiferromagnetic order at T N = 2.9 K and a characteristic Kondo behaviour below 100 K, and down to 3 K. In YbPtAl a local minimum was observed at T = 35 K, followed by a maximum at 10 K, and a step decrease below T N = 5.8 K indicating the onset of antiferromagnetism [7,8]. In YbPtIn, YbRhSn and YbNiGa a typical logarithmic increase with the decrease of the temperature was also observed [9]. In the other hand, other antiferromagnetic Kondo lattice compounds also display additional interesting features as quenched superconductivity by the Kondo effect in Yb 2 Fe 3 Si 5 [10] and antiferromagnetic fluctuations in YbNiB 4 [11].…”

Valence behaviour of ytterbium in YbNiGa4

“…8 shows the Yb valence in the Yb-Ni-Ga system. Besides the literature data concerning the Yb ground state in the presently known binary [21][22][23][24][25][26][27][28] and ternary [29][30][31] compounds, we plot our recently obtained data for YbNi 3 Ga 9 , YbNi 3 Ga 2 , YbNi 4 Ga [32] and Yb 2 Ni 2±x Ga 1±x [33]. Ytterbium is trivalent (4f 13 ground state) in all Yb-Ni compounds with a Ni content ≥50%.…”

Crystal growth, transport, and magnetic properties of Ln3Co4Sn13 (Ln=La, Ce) with a perovskite-like structure

“…In the equiatomic LnRhSn group of compounds, LaRhSn becomes superconducting below 1.7 K [4]. The Kondo system, CeRhSn, shows valence fluctuations [5], and YbRhSn is a heavy fermion with an electronic specific heat coefficient g$1200 mJ mol À1 K À2 [6][7][8][9][10]. Heavy fermions are materials that possess large enhanced electronic masses (g$100 times that of a free electron) as a result of the interactions between the conduction electrons and the local magnetic ions at low temperatures [11,12].…”