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首页> 外文期刊>Physical review, B. Condensed matter and materials physics >Mott localization in a pure stripe antiferromagnet Rb1-delta Fe1.5-sigma S2
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Mott localization in a pure stripe antiferromagnet Rb1-delta Fe1.5-sigma S2

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摘要

A combination of neutron diffraction and angle-resolved photoemission spectroscopy measurements on a pure antiferromagnetic stripe Rb1-delta Fe1.5-sigma S2 is reported. A neutron diffraction experiment on a powder sample shows that a 98 volume fraction of the sample is in the antiferromagnetic stripe phase with rhombic iron vacancy order and a refined composition of Rb0.66Fe1.36S2, and that only 2 of the sample is in the block antiferromagnetic phase with root 5 x root 5 iron vacancy order. Furthermore, a neutron diffraction experiment on a single crystal shows that there is only a single phase with the stripe antiferromagnetic order with the refined composition of Rb0.78Fe1.35S2, while the phase with block antiferromagnetic order is absent. Angle-resolved photoemission spectroscopy measurements on the same crystal with the pure stripe phase reveal that the electronic structure is gapped at the Fermi level with a gap larger than 0.325 eV. The data collectively demonstrate that the extra 10 iron vacancies in addition to the rhombic iron vacancy order effectively impede the formation of the block antiferromagnetic phase; the data also suggest that the stripe antiferromagnetic phase with rhombic iron vacancy order is a Mott insulator.

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