Incommensurate nodes in the energy spectrum of weakly coupled antiferromagnetic Heisenberg ladders

M. Azzouz, B. Dumoulin, A. Benyoussef

Heisenberg ladders are investigated using the bond-mean-field theory [M.Azzouz, Phys. Rev. B 48, 6136 (1993)]. The zero inter-ladder coupling energy gap, the uniform spin susceptib…