We consider the dimerized spin‐1/2 Heisenberg chain with spin hexameric distortion of the exchange pattern and study the zero‐temperature phase diagram in the parameter space (J1, J2, J3) by a continuum‐limit bosonization approach and the exact diagonalization method. The phase diagram is rich and has two gapped dimer phases. We obtain an estimate of the critical line separating the different gapped...
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