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

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

1996-11-06

arxiv.org/abs/cond-mat/9611049v1

Physics

Condensed Matter

4 revtex pages, 3 figures available upon request

Scientific paper

10.1103/PhysRevB.55.R11957

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 susceptibility and the nuclear magnetic resonance spin-relaxation rate are calculated as a function of temperature and magnetic field. For weakly coupled ladders, the energy spectrum vanishes at incommensurate wavevectors giving rise to nodes. As a consequence, the spin susceptibility becomes linear at low temperature. Our results for the single ladder successfully compare to experiments on SrCu_2O_3 and (VO)_2P_2O_7 materials and new predictions concerning the coupling to the magnetic field are made.

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