Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-01-31
Phys. Rev. B 62, 3271 (2000)
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 5 embedded figurs
Scientific paper
10.1103/PhysRevB.62.3271
Within the Dyson-Maleev boson formalism, we study the zero-temperature magnon dispersions in a family of one-dimensional quantum Heisenberg ferrimagnets composed of two different spins $(S_1,S_2)$ in the elementary cell. It is shown that the spin-wave theory can produce precise quantitative results for the low-energy excitations. The spin-stiffness constant $\rho_s$ and the optical magnon gap $\Delta$ of different $(S_1,S_2)$ ferrimagnetic systems are calculated, respectively, to second and third order in the quasiparticle interaction. The spin-wave results are compared with available numerical estimates.
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