Abstract
We present a method which combines a thermal coherent state approach with aself-consistent quantum theory to investigate the spin-1/2 dimerizedantiferromagnetic Heisenberg chain. It is found that both excitation gapsbetween the ground state and two lowest excited modes, the tripletone-magnon excitation and the singlet two-magnon bound state decreasemonotonically with increasing temperature. Our results are consistent withthose obtained from the other approximations.
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