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

Vladimirov, Artem A.; Ihle, Dieter; Plakida, Nikolay M.

doi:10.1140/epjb/e2017-70720-9

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

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Plakida, Nikolay M.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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https://link.springer.com/article/10.1140/epjb/e2017-70720-9
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Citation

Vladimirov, A. A., Ihle, D., & Plakida, N. M. (2017). Spin excitations and thermodynamics of the antiferromagnetic Heisenberg model on the layered honeycomb lattice. European Physical Journal B, 90(3): 48. doi:10.1140/epjb/e2017-70720-9.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-AE26-5

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, Neel 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 Neel 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 beta-Cu2V2O2 compound.