Mott localization in a pure stripe antiferromagnet Rb1-δFe1.5-σS2

Wang, Meng; Yi, Ming; Cao, Huibo; de la Cruz, C.; Mo, S. K.; Huang, Q. Z.; Bourret-Courchesne, E.; Dai, Pengcheng; Lee, D. H.; Shen, Z. X.; Birgeneau, R. J.

doi:10.1103/PhysRevB.92.121101

Mott localization in a pure stripe antiferromagnet ${Rb}_{1 - δ} {Fe}_{1.5 - σ} S_{2}$

Journal Article · Tue Sep 01 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.121101· OSTI ID:1260557

Wang, Meng; Yi, Ming; Cao, Huibo; de la Cruz, C.; Mo, S. K.; Huang, Q. Z.; Bourret-Courchesne, E.; Dai, Pengcheng; Lee, D. H.; Shen, Z. X.; Birgeneau, R. J.

A combination of neutron diffraction and angle-resolved photoemission spectroscopy measurements on a pure antiferromagnetic stripe Rb_1-δFe_1.5-σS₂ 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 Rb_0.66Fe_1.36S₂, and that only 2% of the sample is in the block antiferromagnetic phase with √5×√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 Rb_0.78Fe_1.35S₂, 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.

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

DOE Contract Number:: AC02-05CH11231; SC0012311; AC02-76SF00515

OSTI ID:: 1260557

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 12 Vol. 92; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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