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A combination of neutron diffraction and angle-resolved photoemissionspectroscopy measurements on a pure antiferromagnetic stripeRb$_{1-\delta}$Fe$_{1.5-\sigma}$S$_2$ is reported. A neutron diffractionexperiment on a powder sample shows that a 98$\%$ volume fraction of the sampleis in the antiferromagnetic stripe phase with rhombic iron vacancy order and arefined composition of Rb$_{0.66}$Fe$_{1.36}$S$_{2}$, and that only 2$\%$ ofthe sample is in the block antiferromagnetic phase with $\sqrt{5}\times\sqrt{5}$ iron vacancy order. Furthermore, a neutron diffraction experiment ona single crystal shows that there is only a single phase with the stripeantiferromagnetic order with the refined composition ofRb$_{0.78}$Fe$_{1.35}$S$_2$, while the phase with block antiferromagnetic orderis absent. Angle-resolved photoemission spectroscopy measurements on the samecrystal with the pure stripe phase reveal that the electronic structure isgapped at the Fermi level with a gap larger than 0.325 eV. The datacollectively demonstrates that the extra 10$\%$ iron vacancies in addition tothe rhombic iron vacancy order effectively impede the formation of the blockantiferromagnetic phase; the data also suggest that the stripeantiferromagnetic phase with rhombic iron vacancy order is a Mott insulator.

Mott localization in a pure stripe antiferromagnet Rb$_{1-\delta}$Fe$_{1.5-\sigma}$S$_2$