Spin-Wave Results for the Staggered Magnetization of Triangular Heisenberg Antiferromagnet

概要

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The staggered magnetization of the Heisenberg antiferromagnet on triangular lat-Lice is calculated by means of the usual spin-wave theory. The magnetization is de-rived from the ground-state energy as its derivative with respect to the staggered field,and given in a form of l 75 expansion, S being the magnitude of spins. The second-lowest correction, a term of 0(1/S), consists of two contributions; one from thefirst-order effect of four-boson terms in the Hamiltonian, and another from the sec-ond-order perturbation due to a three-boson term. Each contribution diverges whenthe exchange interaction is isotropic, but the divergent parts of the two contributionsare found to cancel, leaving a finite result for the staggered magnetization to thisorder. Numerical result for the staggered magnetization is S -0.2613-F-0.0055/S.antiferromagnet, Heisenberg spin, triangular lattice, staggered magnetization,sublattice magnetization, spin wave, theory
社団法人日本物理学会の論文
1992-03-15