Magnetic property and crystalline electric field effect in ThCr${}_2$Si${}_2$-type CeNi${}_2$As${}_2$

Abstract

Millimeter sized ThCr${}_2$Si${}_2$-type CeNi${}_2$As${}_2$ single crystal was synthesized by NaAs flux method and its physical properties were investigated by magnetization, transport and specific heat measurements. In contrast to the previously reported CaBe${}_2$Ge${}_2$-type CeNi${}_2$As${}_2$, the ThCr${}_2$Si${}_2$-type CeNi${}_2$As${}_2$ is a highly anisotropic uniaxial antiferromagnet with the transition temperature $T_N$=4.8 K. A field induced spin flop transition was seen below $T_N$ when the applied $\text{B}$ is parallel to the $\text{c}$-axis, the magnetic easy axis, together with a huge frustration parameter $f={\theta }_W/T_N$. A pronounced Schottky-like anomaly in specific heat was also found around 160 K, which could be attributed to the crystalline electric field effect with the excitation energies being fitted to ${\Delta }_1=$325 K and ${\Delta }_2=$520 K, respectively. Moreover, the in-plane resistivity anisotropy and low temperature X-ray diffractions suggest that this compound is a rare example exhibiting a possible structure distortion induced by the $4f$-electron magnetic frustration.

arXiv comment10 pages, 9 figures, 2 tables

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