We studied the physical properties of two Kondo-lattice compounds, CeRu2As2 and CeIr2As2, by a combination of electric transport, magnetic and thermodynamic measurements. They are of ThCr2Si2-type and CaBe2Ge2-type crystalline structures, respectively. CeRu2As2 shows localized long-range antiferromagnetic ordering below TN=4.3 K, with a moderate electronic Sommerfeld coefficient γ0=35 mJ/mol⋅K2. A field-induced metamagnetic transition is observed near 2 T below TN. Magnetic susceptibility measurements on aligned CeRu2As2 powders suggest that it has an easy axis and that the cerium moments align uniaxially along c axis. In contrast, CeIr2As2 is a magnetically nonordered heavy-fermion metal with enhanced γ0>300 mJ/mol⋅K2. The initial onset Kondo temperatures of the two compounds are respectively 6 K and 30 K. We discuss the role of the crystal structure to the strength of Kondo coupling. This work provides two new dense Kondo-lattice materials for further investigations on electronic correlation, quantum criticality and heavy-electron effects.
@article{arxiv.1909.04447,
title = {Synthesis and physical properties of CeRu$_2$As$_2$ and CeIr$_2$As$_2$},
author = {Kangqiao Cheng and Xiaobo He and Haiyang Yang and Binjie Zhou and Yuke Li and Yongkang Luo},
journal= {arXiv preprint arXiv:1909.04447},
year = {2019}
}