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Heisenberg ladders are investigated using the bond-mean-field theory[M.Azzouz, Phys. Rev. B 48, 6136 (1993)]. The zero inter-ladder coupling energygap, the uniform spin susceptibility and the nuclear magnetic resonancespin-relaxation rate are calculated as a function of temperature and magneticfield. For weakly coupled ladders, the energy spectrum vanishes atincommensurate wavevectors giving rise to nodes. As a consequence, the spinsusceptibility becomes linear at low temperature. Our results for the singleladder successfully compare to experiments on SrCu_2O_3 and (VO)_2P_2O_7materials and new predictions concerning the coupling to the magnetic field aremade.Comment: 4 revtex pages, 3 figures available upon reques

Incommensurate nodes in the energy spectrum of coupled antiferromagnetic Heisenberg ladders