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首页> 外文期刊>The Journal of Chemical Physics >Low temperature EPR spectra of the mesoscopic cluster V-15: The role of antisymmetric exchange
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Low temperature EPR spectra of the mesoscopic cluster V-15: The role of antisymmetric exchange

机译：V-15介观簇的低温EPR谱：反对称交换的作用

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摘要

The low temperature EPR spectra of the unique nanometer-scale molecular magnet V-15 are analyzed within the three-spin model preserving trigonal symmetry. The Hamiltonian includes isotropic and antisymmetric (AS) exchange interactions introduced by Dzyaloshinsky (Zh. Eksp. Teor. Fiz. 32, 1547 (1957) [Sov. Phys. JETP 5, 1259 (1957)]) and [Moria Phys. Rev. 120, 91 (1960)]. With the aid of pseudoangular momentum representation the exact selection rules for the EPR transitions are deduced. AS exchange in the frustrated triangular system gives rise to a first order zero-field splitting of two low lying spin doublets and to a second order splitting of the excited quadruplet. This leads to a peculiar series of strong intramultiplet transitions and weak intermultiplet transitions. We show that the intramultiplet transitions are allowed only when the vector of the AS exchange is normal to the plane of vanadium triangle, but the series of weak intermultiplet transitions are a consequence of the in-plane part of the AS exchange. We have revealed a special temperature dependence of the EPR pattern with a peculiar shape of the full spectrum. Experimental data on high-frequency EPR of V-15 at ultralow temperature are discussed. (c) 2006 American Institute of Physics.
机译：在保留三角对称性的三旋转模型中分析了独特的纳米级分子磁体V-15的低温EPR光谱。哈密​​顿量包括由Dzyaloshinsky（Zh。Eksp。Teor。Fiz。32，1547（1957）[Sov。Phys。JETP 5，1259（1957）]）和[Moria Phys。 Rev. 120，91（1960）]。借助伪角动量表示，可以得出用于EPR过渡的精确选择规则。沮丧的三角系统中的AS交换引起两个低位自旋双峰对的一阶零场分裂和激发的四联体的二阶分裂。这导致了一系列特殊的强多重内转换和弱多重间转换。我们表明，仅当AS交换的向量垂直于钒三角形平面时才允许进行多次内跃迁，但是一系列弱多次跃迁是AS交换的面内部分的结果。我们已经揭示了EPR模式的特殊温度依赖性以及全光谱的特殊形状。讨论了V-15在超低温下的高频EPR实验数据。 （c）2006年美国物理研究所。

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