Magnon dispersions in quantum Heisenberg ferrimagnetic chains at zero temperature

Abstract

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.

9 pages, 5 embedded figurs

References in corpus (3)

• Coupled Ladders in a Magnetic Field
• Thermodynamics of the (1,1/2) Ferrimagnet in Finite Magnetic Fields
• Magnetic Properties of a Quantum Ferrimagnet: NiCu(pba)(D_2O)_3 . 2D_2O

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• Low-energy structure of the intertwining double-chain ferrimagnets A_3_Cu_3_(PO_4_)_4_ (A=Ca,Sr,Pb)
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• Stability and Absence of a Tower of States in Ferrimagnets
• Numerical interchain mean-field theory for the specific heat of the bimetallic ferromagnetically coupled chain compound MnNi(NO${}_2$)${}_4$(en)${}_2$ (en = ethylenediamine)
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• Dimensional crossover in alternating spin chains