η-Exponents in the one dimensional antiferromagnetic Heisenberg model with next to nearest neighbour coupling
Abstract
We investigate the critical exponents η3(α,M), η1(α,M) associated with the singularities in the longitudinal and transverse structure factors of the one dimensional antiferromagnetic Heisenberg model with nearest (J1) and next to nearest (J2) neighbour coupling of relative strength α = J2/J1 and an external field B with magnetization M(B).
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