Journal ArticleDOI
An X-Y antiferromagnet
TLDR
In this paper, a two-sublattice X-Y antiferromagnet is treated using the second-order Green function theory, and the higher order Green functions are decoupled by the random phase approximation (RPA), and the transition temperature T N, where the paramagnetic staggered susceptibility diverges.About:
This article is published in Physics Letters A.The article was published on 1980-03-17. It has received 3 citations till now. The article focuses on the topics: Antiferromagnetism & Random phase approximation.read more
Citations
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Journal ArticleDOI
Thermodynamics of the d = 3 + 1 quantum XY model
TL;DR: In this paper, the authors systematically analyzed the thermodynamics of the $d$=3+1 quantum XY model up to three-loop order, and compared their results with those for the quantum ρ = 2+1 model in the one-loop regime.
Journal ArticleDOI
Green function theory of a Heisenberg antiferromagnet
R Brahmachari,S B Bhattacharjee +1 more
TL;DR: In this paper, a second-order Green function theory is developed for a two-sublattice antiferromagnet using the random phase decoupling approximations (RPA).
Journal ArticleDOI
Thermodynamics of the $d$=3+1 Quantum XY Model
TL;DR: In this article, the authors systematically analyzed the thermodynamics of the $d$=3+1 quantum XY model up to three-loop order, and compared their results with those for the quantum ρ = 2+1 model in the one-loop regime.
References
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Journal ArticleDOI
Exact high temperature series expansions for the XY model
TL;DR: In this paper, a method for the exact high temperature series expansion of thermodynamic properties of the spin 1/2 XY model of ferromagnetism or of a quantum lattice gas was developed.
Journal ArticleDOI
Green's function method for antiferromagnetism
TL;DR: In this paper, the statistical mechanics of simple antiferromagnets are studied over the entire temperature range by methods similar to those of Callen and Liu for ferromagnetism.
Journal ArticleDOI
A green function approach to the paramagnetic phase of a Heisenberg ferromagnet
R.H. Knapp,D. Ter Haar +1 more
TL;DR: In this paper, a higher-order decoupling similar to the first-order Bogolyubov-Tyablikov decoupled is used to find various correlation functions in the paramagnetic region for a Heisenberg ferromagnet.
Journal ArticleDOI
A Second Order Green Function Theory of a Heisenberg Ferromagnet
Takeshi Kawabe,Isao Mannari +1 more
Journal ArticleDOI
Heisenberg antiferromagnet using the Green's function theory
TL;DR: In this paper, the second-order Green's function is applied to the discussion of paramagnetic phase of the Heisenberg antiferromagnet and the decoupling parameter is introduced to ensure the self-consistency requirement.
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