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arXiv 2201.11778cond-mat.str-elcond-mat.mtrl-sci
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Y $_2$ Co $_3$的强反铁磁性

Robust antiferromagnetism in Y$_2$Co$_3$

Yunshu Shi, David S. Parker, Eun Sang Choi, Kasey P. Devlin, Li Yin, Jingtai Zhao, Peter Klavins, Susan M. Kauzlarich, Valentin Taufour

摘要:

我们报道了一种基于溶液生长的方法来合成Y $_2$ Co $_3$单晶,并对其结构和磁性进行了研究。发现Y $_2$ Co $_3$的晶体结构为La_2Ni_3型正交晶系,空间群为Cmce(No.64),Co形成畸变的kagome晶格. Y $_2$ Co $_3$在低于$T_N$ = 252 K时反铁磁性有序。磁化测量显示,主要是沿b轴对齐的时刻与一些倾斜的证据。能带结构计算表明,铁磁和反铁磁序几乎是简并的,与实验结果不符。在1GPa压力下的磁化强度测量结果表明,N-eel温度以-1.69K/GPa的斜率下降。在1.5 K和21 T下,当磁场沿b方向时,我们观察到了场致自旋翻转转变。磁化强度在高达35 T时不饱和,表明Y $_2$ Co $_3$中的反铁磁有序是相当稳健的,这对于这样的富Co金属间化合物是令人惊讶的。

英文摘要:

We report on a solution-growth based method to synthesise single crystals of Y$_2$Co$_3$ and on its structural and magnetic properties. We find that Y$_2$Co$_3$ crystallizes in the La2Ni3-type orthorhombic structure with space group Cmce (No. 64), with Co forming distorted kagome lattices. Y$_2$Co$_3$ orders antiferromagnetically below $T_N$ = 252 K. Magnetization measurements reveal that the moments are primarily aligned along the b axis with evidence for some canting. Band-structure calculations indicate that ferromagnetic and antiferromagnetic orders are nearly degenerate, at odds with experimental results. Magnetization measurements under pressure up to 1 GPa reveal that the N/'eel temperature decreases with the slope of -1.69 K/GPa. We observe a field-induced spin-flop transition in the magnetization measurements at 1.5 K and 21 T with magnetic field along the b direction. The magnetization is not saturated up to 35 T, indicating that the antiferromagnetic ordering in Y$_2$Co$_3$ is quite robust, which is surprising for such a Co-rich intermetallic.

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