Abstract
Elementary excitations in the s-d model are calculated at finite temperatures with the use of the Bethe-ansatz solution. Our formulation of the spectra is based on Yang and Yang’s method which has been developed in the one-dimensional interacting boson system. We investigate the temperature dependence of the spin excitation spectra. It is shown that the narrow peak structure develops in the low energy region as the temperature is decreased. At low temperatures, the shape of the spectra is described well by the renormalized resonance level model.
