Large-s expansions for the low-energy parameters of the honeycomb-lattice Heisenberg antiferromagnet with spin quantum number s
The coupled cluster method (CCM) is employed to very high orders of approximation to study the ground-state (GS) properties of the spin-s Heisenberg antiferromagnet (with isotropic interactions, all of equal strength, between nearest-neighbour pairs only) on the honeycomb lattice. We calculate with...
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Veröffentlicht in: | Journal of magnetism and magnetic materials 2016-06, Vol.407, p.348-357 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The coupled cluster method (CCM) is employed to very high orders of approximation to study the ground-state (GS) properties of the spin-s Heisenberg antiferromagnet (with isotropic interactions, all of equal strength, between nearest-neighbour pairs only) on the honeycomb lattice. We calculate with high accuracy the complete set of GS parameters that fully describes the low-energy behaviour of the system, in terms of an effective magnon field theory, viz., the energy per spin, the magnetic order parameter (i.e., the sublattice magnetization), the spin stiffness and the zero-field (uniform, transverse) magnetic susceptibility, for all values of the spin quantum numbers in the range 12≤s≤92. The CCM data points are used to calculate the leading quantum corrections to the classical (s→∞) values of these low-energy parameters, considered as large-s asymptotic expansions.
•The honeycomb-lattice spin-s Heisenberg antiferromagnet is studied for arbitrary s.•Spin quantum numbers in the range s=1/2 to s=9/2 are considered.•A complete set of accurate low-energy GS parameters is provided for each s.•The coupled cluster method is employed at high orders to yield unsurpassed accuracy.•Leading quantum corrections to the classical values of the GS parameters are found. |
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ISSN: | 0304-8853 |
DOI: | 10.1016/j.jmmm.2016.01.101 |