Vol. 29 No. 2 (2019)
Papers

Magnetic Order in Heisenberg Models on Non-Bravais Lattice: Popov-Fedotov Functional Method

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  • Pham Thi Thanh Nga,
  • Nguyen Toan Thang
Pham Thi Thanh Nga
Thuy loi University, 175 Tay Son, Hanoi
Nguyen Toan Thang
Institute of Physics, VAST
DOI: https://doi.org/10.15625/0868-3166/29/2/13508

Published 14-05-2019

Keywords

  • Popov - Fedotov trick,
  • functional integral,
  • Heisenberg model,
  • non-Bravais lattice

How to Cite

Nga, P. T. T., & Thang, N. T. (2019). Magnetic Order in Heisenberg Models on Non-Bravais Lattice: Popov-Fedotov Functional Method. Communications in Physics, 29(2), 119. https://doi.org/10.15625/0868-3166/29/2/13508
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Abstract

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.
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