Fig. 4: Nature of the high-P 1/5 plateau.

The spin structure consists of vertical stripes of partially polarized full plaquettes which are separated by vertical singlets along the red dashed line. Each stripe can effectively be described by a spin-1 diamond chain in a magnetic field at filling 2/3, in which polarized S = 1 spins (T1) and dimer triplets, made of an antisymmetric combination of T1 and T0, are alternating.