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首页> 外文期刊>Physical review >Exact and density matrix renormaiization group studies of two mixed spin-(1/2,5/2,1/2) branched-chain models developed for a heterotrimetallic Fe-Mn-Cu coordination polymer
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Exact and density matrix renormaiization group studies of two mixed spin-(1/2,5/2,1/2) branched-chain models developed for a heterotrimetallic Fe-Mn-Cu coordination polymer

机译：对异过Fe-Mn-Cu Cu-Cu配位聚合物开发的两个混合旋转（1 / 2,5 / 2,1 / 2）支链模型的精确和密度矩阵重型化组研究

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摘要

The mixed-spin Ising-Heisenberg and Heisenberg branched chains whose magnetic backbone consists of regularly alternating spins 1/2 and 5/2, the latter of which are additionally coupled to an extra spin 1/2 providing lateral branching, are investigated using exact analytical and density matrix renormaiization group (DMRG) methods. The proposed spin-chain models capture some relevant aspects of the heterotrimetallic coordination polymer [CuMn(L)][Fe(bpb)(CN)_2] · ClO_4 • H_2O. The mixed spin-(l/2. 5/2, 1/2) Ising-Heisenberg branched chain is exactly solvable under the assumption of an Ising-like exchange coupling along the chain, while the lateral branching is treated as an anisotropic XXZ Heisenberg exchange interaction. We determine the ground-state phase diagram and quantify a bipartite quantum entanglement between dimers at lateral branching. It is shown that the studied mixed-spin Ising-Heisenberg branched chain accurately tits available experimental data for temperature dependence of the magnetic susceptibility. The ground-state phase diagram of the analogous mixed spin-(l/2. 5/2, 1/2) Heisenberg branched chain is obtained within the DMRG method. The ground-state phase diagrams of the Ising-Heisenberg and its full Heisenberg counterpart are contrasted. In particular, the ground-stale phase diagram of the mixed-spin Heisenberg branched chain involves a special Gaussian critical point, for which a proper finite-size scaling analysis is provided to accurately estimate its location and the correlation length critical exponent.
机译：混合旋转ising-heisenberg和Heisenberg支链，其磁性骨架由定期交替旋转1/2和5/2组成，后者另外偶联与提供横向支化的额外旋转1/2，进行精确分析和密度矩阵重量化组（DMRG）方法。所提出的旋转链模型捕获异质配合聚合物[CUMN（L）] [Fe（BPB）（CN）_2]·CLO_4•H_2O的一些相关方面。混合旋转 - （L / 2。5/2,1/2）ising-heisenberg支链在沿链条的静物相结合的假设下完全可溶，而横向支化被视为各向异性XXZ Heisenberg交换互动。我们确定地态相图，并在横向分支下量化二聚体之间的二分量子缠结。结果表明，研究的混合旋转型 - Heisenberg支链准确地达到可用的实验数据，用于磁化率的温度依赖性。在DMRG法中获得类似混合旋转 - （L / 2。5/2,1/2）Heisenberg支链的地态相图。对比的是ising-heisenberg及其完整的Heisenberg对应物的地态相图。特别地，混合旋转Heisenberg分支链的地陈置相图涉及特殊的高斯临界点，其中提供了适当的有限尺寸缩放分析，以便精确地估计其位置和相关长度临界指数。

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  • 来源
    《Physical review》 |2020年第6期|064414.1-064414.13|共13页
  • 作者

    Fabiana Souza; Luan M. Verissimo; Jozef Strecka; Marcelo L. Lyra; Maria S. S. Pereira;

  • 作者单位

    Institute de Fisica Universidade Federal de Alagoas 57072-970 Maceio Alagoas Brazil;

    Institute de Fisica Universidade Federal de Alagoas 57072-970 Maceio Alagoas Brazil;

    Department of Theoretical Physics and Astrophysics Faculty of Science P. J. Safarik University Park Angelinum 9 040 01 Kosice Slovakia;

    Institute de Fisica Universidade Federal de Alagoas 57072-970 Maceio Alagoas Brazil;

    Institute de Fisica Universidade Federal de Alagoas 57072-970 Maceio Alagoas Brazil;

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