arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1102.3330cond-mat.mtrl-sci
收藏

用第一性原理计算S=3/2蜂窝体系中的磁交换耦合

Calculation of magnetic exchange couplings in S=3/2 honeycomb system Bi$_3$Mn$_4$O$_{12}$(NO$_3$)} from first principles

Hem C. Kandpal, Jeroen van den Brink

摘要:

在Bi $_3$ Mn $_4$ O $_{12}$(NO $_3$),(BMNO)中没有磁有序,其具有由自旋S=3/2的Mn $^{4+}$离子的蜂窝双层组成的磁子系统,已经提出了由于较长范围的反铁磁相互作用,其基态强烈受挫的期望。我们用密度泛函方法计算了BMNO复合物的磁交换耦合常数,发现Mn自旋之间的主要相互作用是反铁磁最近邻相互作用$J_1$和层间相互作用$J_c$ .最大的相互作用是$J_c$,其显著超过$J_1$。较长范围的相互作用是反铁磁的,但只有微弱的令人沮丧。

英文摘要:

Absence of magnetic ordering in Bi$_3$Mn$_4$O$_{12}$(NO$_3$), (BMNO) which has a magnetic subsystem that consists of honeycomb bi-layers of Mn$^{4+}$ ions with spin S=3/2, has raised the expectation that its ground state is strongly frustrated due to longer-range antiferromagnetic interactions. We calculate the magnetic exchange coupling constants of the BMNO complex within a density functional approach and find that the dominating interactions between Mn spins are the antiferromagnetic nearest-neighbor $J_1$ and interlayer interaction $J_c$. The largest interaction is $J_c$, which substantially exceeds $J_1$. Longer-range interactions are antiferromagnetic, but only weakly frustrating.

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。

↑