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Title: Mott localization in a pure stripe antiferromagnet Rb 1 - δ Fe 1.5 - σ S 2

Abstract

A combination of neutron diffraction and angle-resolved photoemission spectroscopy measurements on a pure antiferromagnetic stripe Rb 1-δFe 1.5-σS 2 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 1.36S 2, 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 1.35S 2, 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.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1260557
DOE Contract Number:  
AC02-05CH11231; AC03-76SF008; SC0012311; AC02-76SF00515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 92; Journal Issue: 12
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

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., and Birgeneau, R. J. Mott localization in a pure stripe antiferromagnet Rb1-δFe1.5-σS2. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.92.121101.
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. Mott localization in a pure stripe antiferromagnet Rb1-δFe1.5-σS2. United States. doi:10.1103/PhysRevB.92.121101.
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., and Birgeneau, R. J. Tue . "Mott localization in a pure stripe antiferromagnet Rb1-δFe1.5-σS2". United States. doi:10.1103/PhysRevB.92.121101.
@article{osti_1260557,
title = {Mott localization in a pure stripe antiferromagnet Rb1-δFe1.5-σS2},
author = {Wang, Meng and Yi, Ming and Cao, Huibo and de la Cruz, C. and Mo, S. K. and Huang, Q. Z. and Bourret-Courchesne, E. and Dai, Pengcheng and Lee, D. H. and Shen, Z. X. and Birgeneau, R. J.},
abstractNote = {A combination of neutron diffraction and angle-resolved photoemission spectroscopy measurements on a pure antiferromagnetic stripe Rb1-δFe1.5-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 Rb0.66Fe1.36S2, 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 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.},
doi = {10.1103/PhysRevB.92.121101},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 12,
volume = 92,
place = {United States},
year = {Tue Sep 01 00:00:00 EDT 2015},
month = {Tue Sep 01 00:00:00 EDT 2015}
}