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arXiv 2109.09608cond-mat.str-el
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新化合物$\mbox{Sm}_2\mbox{Ag}\mbox{Si}_3$的随机磁各向异性

Random magnetic anisotropy in a new compound $\mbox{Sm}_2\mbox{Ag}\mbox{Si}_3$

Baidyanath Sahu, R. Djoumessi Fobasso, Andre M. Strydom

摘要:

报道了一种新型三元金属间化合物$\mathrm{Sm_2AgSi_3}$的结构和磁性的实验研究。通过X射线衍射、直流磁化强度和热容测量对样品的性质进行了详细的研究。$\mathrm{Sm_2AgSi_3}$的多晶化合物以$\mathrm{ThSi_2}$型四元结构(空间群${I_{4_1}/amd}$)结晶。随温度变化的直流磁化强度和热容结果表明,该化合物具有铁磁性,居里温度($T_C$)为14 K。磁滞回线中较大的矫顽场和铁磁区的热磁不可逆性表明该化合物具有较大的磁各向异性。从M-H环得到的外加磁场和磁化强度的大小与磁化数据中的热磁不可逆性相印证。热容量的磁贡献揭示了一个广泛的肖特基型异常以上$T_C$,由于在$\mathrm{Sm_2AgSi_3}$的$\mathrm{Sm^{3+}}$晶体电场效应的存在。

英文摘要:

We report the experimental study on the structural and magnetic properties of a new ternary intermetallic compound $\mathrm{Sm_2AgSi_3}$. The properties of the sample were investigated in detail by X-ray diffraction, dc-magnetization, and heat capacity measurements. The polycrystalline compound of $\mathrm{Sm_2AgSi_3}$ crystallizes in the $\mathrm{ThSi_2}$-type tetragonal structure (space group ${I_{4_1}/amd}$). The temperature-dependent dc-magnetization and heat capacity results demonstrate that the compound undergoes ferromagnetic behaviour with a Curie temperature ($T_C$) of 14 K. The large coercive field in hysteresis loops and the thermomagnetic irreversibility in the ferromagnetic region revealed that the compound exhibits a large magnetic anisotropy. The magnitude of the applied field and the coercivity obtained from the M-H loops corroborate with the thermomagnetic irreversibility in the magnetization data. The magnetic contribution of the heat capacity reveals a broad Schottky-type anomaly above $T_C$, due to the presence of the crystal electric field effect of $\mathrm{Sm^{3+}}$ in $\mathrm{Sm_2AgSi_3}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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