Independent magnon states on magnetic polytopes
Independent magnon states on magnetic polytopes
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磁性多面体上的独立磁振子态
DOI：
10.1007/s10051-001-8701-6
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
J. Schulenburg
中科院分区：
文献类型：
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作者：
Jürgen Schnack;H. Schmidt;J. Richter;J. Schulenburg
翻译后摘要：对于许多自旋系统具有恒定的各向同性反铁磁相邻海森堡耦合的最小能量Emin（S）形成一个旋转带，即依赖于近似二次总自旋量子数S，这也被称为Landé间隔规则的属性。然而，我们发现，对于某些耦合拓扑结构，包括最近合成的二十面体结构，这条规则是违反高总自旋。相反，最小能量是总自旋的线性函数。这种异常导致磁化曲线的相应跳跃，否则磁化曲线将是规则的阶梯。
Abstract:For many spin systems with constant isotropic antiferromagnetic next-neighbour Heisenberg coupling the minimal energies Emin(S) form a rotational band, i.e. depend approximately quadratically on the total spin quantum number S, a property which is also known as Landé interval rule. However, we find that for certain coupling topologies, including recently synthesised icosidodecahedral structures this rule is violated for high total spins. Instead the minimal energies are a linear function of total spin. This anomaly results in a corresponding jump of the magnetisation curve which otherwise would be a regular staircase.