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Elementary Excitations of Heisenberg Ferrimagnetic Spin Chains | | Shoji Yamamoto
; S. Brehmer
; H.-J. Mikeska
; | | Date: |
30 Oct 1997 | | Subject: | Statistical Mechanics | cond-mat.stat-mech | | Abstract: | We numerically investigate elementary excitations of the Heisenberg alternating-spin chains with two kinds of spins 1 and 1/2 antiferromagnetically coupled to each other. Employing a recently developed efficient Monte Carlo technique as well as an exact diagonalization method, we verify the spin-wave argument that the model exhibits two distinct excitations from the ground state which are gapless and gapped. The gapless branch shows a quadratic dispersion in the small-momentum region, which is of ferromagnetic type. With the intention of elucidating the physical mechanism of both excitations, we make a perturbation approach from the decoupled-dimer limit. The gapless branch is directly related to spin 1’s, while the gapped branch originates from cooperation of the two kinds of spins. | | Source: | arXiv, cond-mat/9710332 | | Services: | Forum | Review | PDF | Favorites | |
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