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Spin excitations and thermodynamics of the antiferromagnetic Heisenberg model on the layered honeycomb lattice

Author

Listed:
  • Artem A. Vladimirov

    (Joint Institute for Nuclear Research)

  • Dieter Ihle

    (Institut für Theoretische Physik, Universität Leipzig)

  • Nikolay M. Plakida

    (Joint Institute for Nuclear Research
    Max-Planck-Institut für Physik Komplexer Systeme)

Abstract

We present a spin-rotation-invariant Green-function theory for the dynamic spin susceptibility in the spin-1/2 antiferromagnetic Heisenberg model on a stacked honeycomb lattice. Employing a generalized mean-field approximation for arbitrary temperatures, the thermodynamic quantities (two-spin correlation functions, internal energy, magnetic susceptibility, staggered magnetization, Néel temperature, correlation length) and the spin-excitation spectrum are calculated by solving a coupled system of self-consistency equations for the correlation functions. The temperature dependence of the magnetic (uniform static) susceptibility is ascribed to antiferromagnetic short-range order. The Néel temperature is calculated for arbitrary interlayer couplings. Our results are in a good agreement with numerical computations for finite clusters and with available experimental data on the β-Cu2V2O2 compound.

Suggested Citation

  • Artem A. Vladimirov & Dieter Ihle & Nikolay M. Plakida, 2017. "Spin excitations and thermodynamics of the antiferromagnetic Heisenberg model on the layered honeycomb lattice," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 90(3), pages 1-8, March.
    • Handle: RePEc:spr:eurphb:v:90:y:2017:i:3:d:10.1140_epjb_e2017-70720-9
    DOI: 10.1140/epjb/e2017-70720-9
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    Solid State and Materials;

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