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arXiv physics/0606032physics.atm-clus
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锰团簇的结构、电子性质和磁性转变

Structure, electronic properties and magnetic transition in manganese clusters

Mukul Kabir, Abhijit Mookerjee, D. G. Kanhere

摘要:

采用{ \it ab-initio}赝势平面波方法,采用交换关联能的广义梯度近似,系统地研究了Mn $_n$团簇($n =$ 2 $-$ 20)的结构、电子和磁性.在中等尺寸范围内预测了一种新的二十面体结构生长。计算的磁矩与施特恩-格拉赫实验吻合得很好。从铁磁到亚铁磁Mn $-$ Mn耦合的转变发生在$n=$ 5处,并且亚铁磁态继续是整个尺寸范围的基态。在实验束中可能存在多种异构体的争论。在此尺寸范围内没有观察到非金属到金属过渡的特征,并讨论了$d-$电子定位的配位依赖性。

英文摘要:

We systematically investigate the structural, electronic and magnetic properties of Mn$_n$ clusters ($n =$ 2$-$20) within the {\it ab-initio} pseudopotential plane wave method using generalized gradient approximation for the exchange-correlation energy. A new kind of icosahedral structural growth has been predicted in the intermediate size range. Calculated magnetic moments show an excellent agreement with the Stern-Gerlach experiment. A transition from ferromagnetic to ferrimagnetic Mn$-$Mn coupling takes place at $n=$ 5 and the ferrimagnetic states continue to be the ground states for the entire size range. Possible presence of multiple isomers in the experimental beam has been argued. No signature of non-metal to metal transition is observed in this size range and the coordination dependence of $d-$electron localization is discussed.

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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