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arXiv 2301.00396cond-mat.str-el
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氟离子非化学计量电子掺杂Cu $_2$ F $_{5-x}$中二维到一维磁相互作用的演化

2D to 1D magnetic interactions evolution in Cu$_2$F$_{5-x}$ through electron doping by fluoride non-stoichiometry

Dmitry M. Korotin, Dmitry Y. Novoselov, Vladimir I. Anisimov

摘要:

氟化铜Cu $_2$ F $_5$是在$S=1$和$S=\frac{1}{2}$自旋状态中的Cu离子之间具有2D磁交换相互作用的化合物。利用从头计算方法,我们预测了Cu $_2$ F $_5$氟化物亚晶格中5%空位的存在导致了所有铜离子自旋态的剧烈转变,最终自旋态为$S=\frac{1}{2}$和$S=0$ .因此,磁相互作用的各向异性增加,并且出现Cu $d^9$、$S=\frac{1}{2}$离子的一维线性链。我们还提出了一个微观机制,通过CuO $_6$八面体的延伸,这种交换相互作用的转变。

英文摘要:

The copper fluoride Cu$_2$F$_5$ is a compound with 2D-magnetic exchange interactions between the Cu ions in the $S=1$ and $S=\frac{1}{2}$ spin-states. Using ab-initio calculations, we predict that the existence of 5% vacancies in the fluoride sublattice of Cu$_2$F$_5$ results in the drastic transformation of the spin-state of all copper ions and the final spin-states are $S=\frac{1}{2}$ and $S=0$. Consequently, the anisotropy of magnetic interactions increases, and the 1D linear chains of the Cu $d^9$, $S=\frac{1}{2}$ ions appear. We also propose a microscopic mechanism of such exchange interaction transformation via CuO$_6$ octahedra elongation.

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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