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arXiv 2202.01491cond-mat.mtrl-scicond-mat.str-el
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具有红柱石结构的Al $_x$ Fe $_{2-x}$ GeO $_5$的磁性

Magnetism of Al$_x$Fe$_{2-x}$GeO$_5$ with Andalusite Structure

K. Kakimoto, S. Takada, H. Ohta, Y. Haraguchi, M. Hagihala, S. Torii, T. Kamiyama, H. Mitamura, M. Tokunaga, A. Hatakeyama, H. Aruga Katori

摘要:

研究了具有红柱石结构的Al $_x$ Fe $_{2-x}$ GeO $_5$在$x$ = 0.09 ~ $x$ = 0.91范围内的磁性。Al $_x$ Fe $_{2-x}$ GeO $_5$在低温下的磁性被发现对于$x$ $<$ 0.3是弱铁磁类态,对于$x$ $>$ 0.3是自旋玻璃态。出现在弱铁磁相的小的自发磁化强度将是由于存在的Dzyaloshinsky-Moriya相互作用或在八面体和三角双锥网站的Fe $^{3+}$的磁矩的大小的差异。自旋玻璃相的出现表明Al $_x$ Fe $_{2-x}$ GeO $_5$中Al对Fe离子的稀释作用引起了铁磁和反铁磁相互作用的竞争。Fe离子的位置占有率的$x$依赖性表明,不能合成具有红柱石结构的Fe $_2$ GeO $_5$。

英文摘要:

The magnetism of Al$_x$Fe$_{2-x}$GeO$_5$ from $x$ = 0.09 to $x$ = 0.91 with andalusite structure was examined. The magnetic properties of Al$_x$Fe$_{2-x}$GeO$_5$ at low temperatures were found to be weak ferromagnetic-like state for $x$ $<$ 0.3 and spin-glass state for $x$ $>$ 0.3. The small spontaneous magnetization that appears in the weak ferromagnetic-like phase would be due to the presence of Dzyaloshinsky-Moriya interaction or to the difference in the magnitude of the magnetic moment of Fe$^{3+}$ in the octahedral and trigonal bipyramidal sites. The appearance of the spin-glass phase indicates that the dilution of Fe ions by Al ions in Al$_x$Fe$_{2-x}$GeO$_5$ causes the competition between ferromagnetic and antiferromagnetic interactions. The $x$ dependence of the site occupancy of Fe ions suggests that Fe$_2$GeO$_5$ with andalusite structure cannot be synthesized.

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