Magnetic and Transport Properties of the Kondo Lattice Compound YbPtAs**Supported by the National Basic Research Program of China under Grant No 2015CB921303, the National Key Research Program of China under Grant No 2016YFA0300604, the Strategic Priority Research Program (B) of Chinese Academy of Sciences under Grant No XDB07020100, and the National Natural Science Foundation of China under Grant No 11404175.

Abstract

We report the electrical resistivity, magnetic susceptibility, and heat capacity studies on a new intermetallic compound YbPtAs, which crystallizes in a modified AlB2 type structure. The Yb ions in YbPtAs are in a trivalent state and order antiferromagnetically around Néel temperatures TN1 = 6.5 K and TN2 = 2.2 K, respectively, deduced both from the magnetic susceptibility χ(T) and heat capacity C(T) measurements. The magnetic contribution in resistivity, ρm(T), exhibits a broad maximum at around 100 K and a logarithmic temperature dependence in the high-temperature region, indicative of the presence of the Kondo effect in YbPtAs.