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arXiv · 2105.09556

Structure and magnetic properties of the $S=3/2$ zigzag spin chain antiferromagnet BaCoTe$_2$O$_7$

Lisi Li·Xunwu Hu·Zengjia Liu·Jia Yu·Benyuan Cheng·Sihao Deng·Lunhua He·Kun Cao·Dao-Xin Yao·Meng Wang
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Abstract

We report an investigation on structure and magnetic properties of the $S=3/2$ zigzag spin chain compound BaCoTe$_2$O$_7$. Neutron diffraction measurements reveal BaCoTe$_2$O$_7$ crystallizes in the noncentrosymmetric space group $Ama2$ with a canted $\uparrow\uparrow\downarrow\downarrow$ spin structure along the quasi-one-dimensional zigzag chain and a moment size of $1.89(2)\mu_B$ at 2 K. Magnetic susceptibility and specific heat measurements yield an antiferromagnetic phase transition at $T_N=6.2$ K. A negative Curie-Weiss temperature $\Theta_{CW}=-74.7(2)$ K and an empirical frustration parameter of $f=|\Theta_\text{CW}|/T_\text{N}\approx12$ is obtained from fitting the magnetic susceptibility, indicating antiferromagnetic interactions and strong magnetic frustration. By employing ultraviolet-visible absorption spectroscopy and first principles calculations, an indirect band gap of 2.68(2) eV is determined. We propose that the canted zigzag spin chain of BaCoTe$_2$O$_7$ may produce a change of the polarization via exchange striction mechanism.

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Lisi Li, Xunwu Hu, Zengjia Liu, Jia Yu, Benyuan Cheng, Sihao Deng, Lunhua He, Kun Cao, Dao-Xin Yao, Meng Wang. 2021-05-20. Structure and magnetic properties of the $S=3/2$ zigzag spin chain antiferromagnet BaCoTe$_2$O$_7$. https://doi.org/10.1007/s11433-021-1726-0

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