Synthesis and physical properties of CeRu2As2 and CeIr2As2

Kangqiao Cheng, Xiaobo He, Haiyang Yang, Binjie Zhou, Yuke Li, and Yongkang Luo
Phys. Rev. B 100, 205121 – Published 14 November 2019

Abstract

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=4.3K, with a moderate electronic Sommerfeld coefficient γ0=35mJ/molK2. 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>300mJ/molK2. The initial onset Kondo temperatures of the two compounds are, respectively, 6 and 30 K. We discuss the role of the crystal structure to the strength of Kondo coupling. This paper provides two dense Kondo-lattice materials for further investigations on electronic correlation, quantum criticality, and heavy-electron effects.

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  • Received 26 August 2019
  • Revised 8 October 2019

DOI:https://doi.org/10.1103/PhysRevB.100.205121

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Kangqiao Cheng1, Xiaobo He1, Haiyang Yang2, Binjie Zhou1, Yuke Li2,*, and Yongkang Luo1,†

  • 1Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
  • 2Department of Physics and Hangzhou Key Laboratory of Quantum Matters, Hangzhou Normal University, Hangzhou 311121, China

  • *yklee@hznu.edu.cn
  • mpzslyk@gmail.com

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Vol. 100, Iss. 20 — 15 November 2019

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