Abstract
We present theoretical procedure for estimating interchain exchange coupling J′ between antiferromagnetic spin-1/2 Heisenberg chains with frustration due to Dzyaloshinskii-Moriya (DM) interaction characterized by DM vectors Dy which are uniform within each chain y, but staggered between adjacent chains, Dy ∼ (-1)yD. Under a magnetic field h ‖ D we obtain a field-temperature phase diagram which favorably agrees with the one experimentally observed. We then apply chain mean-field (CMF) technique to calculate interchain exchange J′ from the critical field hc at which the transition between the collinear spin-density wave and the cone states takes place. The CMF calculations are found to provide good physical description of the experimental measurements for the wide range of D/J′.
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