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Condensed Matter > Strongly Correlated Electrons

arXiv:1909.04447 (cond-mat)
[Submitted on 10 Sep 2019 (v1), last revised 14 Nov 2019 (this version, v2)]

Title:Synthesis and physical properties of CeRu$_2$As$_2$ and CeIr$_2$As$_2$

Authors:Kangqiao Cheng, Xiaobo He, Haiyang Yang, Binjie Zhou, Yuke Li, Yongkang Luo
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Abstract:We studied the physical properties of two Kondo-lattice compounds, CeRu$_2$As$_2$ and CeIr$_2$As$_2$, by a combination of electric transport, magnetic and thermodynamic measurements. They are of ThCr$_2$Si$_2$-type and CaBe$_2$Ge$_2$-type crystalline structures, respectively. CeRu$_2$As$_2$ shows localized long-range antiferromagnetic ordering below $T_N$=4.3 K, with a moderate electronic Sommerfeld coefficient $\gamma_0$=35 mJ/mol$\cdot$K$^2$. A field-induced metamagnetic transition is observed near 2 T below $T_N$. Magnetic susceptibility measurements on aligned CeRu$_2$As$_2$ powders suggest that it has an easy axis and that the cerium moments align uniaxially along $\mathbf{c}$ axis. In contrast, CeIr$_2$As$_2$ is a magnetically nonordered heavy-fermion metal with enhanced $\gamma_0$$>$300 mJ/mol$\cdot$K$^2$. 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.
Comments: 8 pages, 5+2 figures, 1 table
Subjects: Strongly Correlated Electrons (cond-mat.str-el); Materials Science (cond-mat.mtrl-sci); Superconductivity (cond-mat.supr-con)
Cite as: arXiv:1909.04447 [cond-mat.str-el]
  (or arXiv:1909.04447v2 [cond-mat.str-el] for this version)
  https://doi.org/10.48550/arXiv.1909.04447
Journal reference: Phys. Rev. B 100, 205121 (2019)
Related DOI: https://doi.org/10.1103/PhysRevB.100.205121

Submission history

From: Yongkang Luo Prof. [view email]
[v1] Tue, 10 Sep 2019 12:47:51 UTC (763 KB)
[v2] Thu, 14 Nov 2019 22:04:07 UTC (770 KB)
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