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s = 1/2 antiferromagnetic Heisenberg model on fullerene-type symmetry clusters

机译:富勒烯型对称簇上的s = 1/2反铁磁Heisenberg模型

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摘要

The s_i=1/2 nearest-neighbor antiferromagnetic Heisenberg model is considered for spins sitting on the vertices of clusters with the connectivity of fullerene molecules and a number of sites n ranging from 24 to 32. Using the permutational and spin-inversion symmetries of the Hamiltonian, the low-energy spectrum is calculated for all the irreducible representations of the symmetry group of each cluster. Frustration and connectivity result in nontrivial low-energy properties, with the lowest excited states being singlets except for n=28. Same-hexagon and same-pentagon correlations are the most effective in the minimization of the energy, with the n=32 -D_(3h), symmetry cluster having an unusually strong singlet intrapentagon correlation. The magnetization in a field shows no discontinuities unlike the icosahedral I_h fullerene clusters but only plateaux with the most pronounced for n=28. The spatial symmetry as well as the connectivity of the clusters appear to be important for the determination of their magnetic properties.
机译:s_i = 1/2最近邻反铁磁海森堡模型被认为适用于坐在簇的顶点上的自旋,这些簇具有富勒烯分子的连通性,且n的位点范围从24到32。使用s的排列和自旋反转对称性哈密​​顿量,针对每个簇的对称群的所有不可约表示,计算出低能谱。挫败和连通性导致了非平凡的低能特性,除了n = 28之外,最低激发态为单重态。在能量最小化方面,相同的六边形和相同的五边形相关性最有效,n = 32 -D_(3h)对称簇具有非常强的单线态五边形相关性。与二十面体I_h富勒烯团簇不同,磁场中的磁化强度没有不连续性,只有n = 28最明显的高原。簇的空间对称性和连通性对于确定其磁性能似乎很重要。

著录项

  • 来源
    《Physical review》 |2009年第13期|134427.1-134427.9|共9页
  • 作者

    N. P. Konstantinidis;

  • 作者单位

    Institut fuer Theoretische Physik A, Physikzentrum, RWTH Aachen, 52056 Aachen, Germany Institut fuer Festkoerperforschung-Theorie III, Forschungszentrum Juelich, Leo-Brandt-Strasse, 52425 Juelich, Germany and JARA-Fundamentals of Future Information Technology;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quantized spin models; antiferromagnetics; molecular magnets;

    机译:量化自旋模型反铁磁分子磁铁;

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