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

Artem A. Vladimirov, Dieter Ihle and Nikolay M. Plakida ()
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Artem A. Vladimirov: Joint Institute for Nuclear Research
Dieter Ihle: Institut für Theoretische Physik, Universität Leipzig
Nikolay M. Plakida: Joint Institute for Nuclear Research

The European Physical Journal B: Condensed Matter and Complex Systems, 2017, vol. 90, issue 3, 1-8

Abstract: 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.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1140/epjb/e2017-70720-9

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