Magnetic Order in Heisenberg Models on Non-Bravais Lattice: Popov-Fedotov Functional Method
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https://doi.org/10.15625/0868-3166/29/2/13508Keywords:
Popov - Fedotov trick, functional integral, Heisenberg model, non-Bravais latticeAbstract
We study magnetic properties of ordered phase in Heisenberg model on a non-Bravais lattice by means of Popov - Fedotov trick, which takes into account a rigorous constraint of a single occupancy. We derive magnetization and free energy using sadle point approximation in the functional integral formalism. We illustrate the application of the Popov -- Fedotov approach to the Heisenberg antiferromagnet on a honeycomb lattice.Downloads
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Accepted 03-04-2019
Published 14-05-2019
