η-Exponents in the one dimensional antiferromagnetic Heisenberg model with next to nearest neighbour coupling
We investigate the critical exponents $η_3(α,M), η_1(α,M)$ associated with the singularities in the longitudinal and transverse structure factors of the one dimensional antiferromagnetic Heisenberg model with nearest (J_1) and next to nearest (J_2) neighbour coupling of relative strength $α= {J_2}/{J_1}$ and an external field $B$ with magnetization $M(B)$.
cond-mat↗