科研之友
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摘要
The frustrated spin-1/2 chain with weakly anisotropic ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor exchanges is studied using the scaling estimates of the perturbation theory and numerical calculations. We focus on the excitation spectrum and the low-temperature thermodynamics in the ferromagnetic region of the ground-state phase diagram. It is shown that the excitation spectrum of the model is characterized by the existence of the multimagnon bound states. These excitations determine the low-temperature magnetic susceptibility. The energy of the bound magnon complexes is found and the relation of the considered model to the edge-sharing cuprate Li2CuO2 is discussed.
- 出版日期2009-2
