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arXiv 2103.08500cond-mat.mtrl-sci
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$A_{2}$的磁性phase diagram [ FeCl $_{5}$(H $_{2}$ O)]($A$ = K,Rb,NH $_{4}$)

Magnetic phase diagram of $A_{2}$[FeCl$_{5}$(H$_{2}$O)] ($A$ = K, Rb, NH$_{4}$)

Minseong Lee

摘要:

分子式为A2 FeX 5 H2 O的红菱铁矿,其中A = Rb、K和(NH 4),X = Cl和Br,是有趣的系统,具有各种磁相和电相,以及磁性和铁电性耦合的多铁性相。在这份报告中,我们研究了超交换相互作用的功能的erythrosiderites的磁相图。为此,我们进行经典的蒙特卡罗模拟磁哈密顿包含五个不同的超交换相互作用与单离子各向异性。我们的相图包含了在这些材料中实验观察到的所有磁基态。我们认为,基态可以通过改变J 4/J2的比例来解释。当J 4/J2 > 0.95时,在(NH 4)2FeCl 5 H2O中观察到摆线自旋结构稳定,否则,在(K,Rb)2FeCl 5 H2O中观察到共线自旋结构稳定。我们还表明,沿a-和c-轴的单离子各向异性的差异是必不可少的稳定的中间状态观察到(NH)2FeCl 5 H2O。

英文摘要:

Erythrosiderites with the formula A2FeX5H2O, where A = Rb, K, and (NH4) and X = Cl and Br are intriguing systems that possess various magnetic and electric phases, as well as multiferroic phases in which magnetism and ferroelectricity are coupled. In this report, we study the magnetic phase diagram of erythrosiderites as a function of superexchange interactions. To this end, we perform classical Monte Carlo simulations on magnetic Hamiltonians that contain five different superexchange interactions with single-ion anisotropies. Our phase diagram contains all magnetic ground states that have been experimentally observed in these materials. We argue that the ground states can be explained by varying the ratio of J4/J2. For J4/J2 > 0.95 a cycloidal spins structure is stabilized as observed in (NH4)2FeCl5H2O and otherwise, a collinear spin structure is stabilized as observed in (K,Rb)2FeCl5H2O. We also show that the difference in the single-ion anisotropy along a- and c- axes is essential to stabilize the intermediate state observed in (NH)2FeCl5H2O.

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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