Two spatially separated phases in semiconducting Rb0.8Fe1.5S2

Wang, Meng; Tian, Wei; Valdivia, P.; Chi, Songxue; Bourret-Courchesne, E.; Dai, Pengcheng; Birgeneau, R. J.

doi:10.1103/PhysRevB.90.125148

Title: Two spatially separated phases in semiconducting ${Rb}_{0.8} {Fe}_{1.5} S_{2}$

Journal Article · Fri Sep 26 00:00:00 EDT 2014 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.90.125148· OSTI ID:1159437

Wang, Meng ^[1]; Tian, Wei ^[2]; Valdivia, P. ^[1]; Chi, Songxue ^[2]; Bourret-Courchesne, E. ^[3]; Dai, Pengcheng ^[4]; Birgeneau, R. J. ^[5]

Univ. of California, Berkeley, CA (United States). Dept. of Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Rice Univ., Houston, TX (United States). Department of Physics and Astronomy; Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering

We report neutron scattering and transport measurements on semiconducting Rb_0.8Fe_1.5S₂, a compound isostructural and isoelectronic to the well-studied A_0.8Fe_ySe₂(A = K, Rb, Cs, Tl/K) superconducting systems. Both resistivity and DC susceptibility measurements reveal a magnetic phase transition at T = 275 K. Neutron diffraction studies show that the 275 K transition originates from a phase with rhombic iron vacancy order which exhibits an in-plane stripe antiferromagnetic ordering below 275 K. In addition, the stripe antiferromagnetic phase interdigitates mesoscopically with an ubiquitous phase with √5 x√5 iron vacancy order. This phase has a magnetic transition at T_N = 425 K and an iron vacancy order-disorder transition at T_S = 600 K. These two different structural phases are closely similar to those observed in the isomorphous Se materials. Based on the close similarities of the in-plane antiferromagnetic structures, moments sizes, and ordering temperatures in semiconducting Rb_0.8Fe_1.5S₂ and K_0.81Fe_1.58Se₂, we argue that the in-plane antiferromagnetic order arises from strong coupling between local moments. Superconductivity, previously observed in the A_0.8Fe_ySe_{2₋ z}S_z system, is absent in A_0.8Fe_1.5S₂, which has a semiconducting ground state. We discuss the implied relationship between stripe and block antiferromagnetism and superconductivity in these materials as well as a strategy for further investigation.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

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

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231; AC03-76SF008; DMR-1362219

OSTI ID:: 1159437

Alternate ID(s):: OSTI ID: 1180514

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 12; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Iron-Based Chalcogenide Spin Ladder BaFe2X3 (X = Se,S) Wu, Shan; Frandsen, Benjamin A.; Wang, Meng Journal of Superconductivity and Novel Magnetism, Vol. 33, Issue 1 https://doi.org/10.1007/s10948-019-05304-4	journal	November 2019
High-temperature superconductivity in iron pnictides and chalcogenides Si, Qimiao; Yu, Rong; Abrahams, Elihu Nature Reviews Materials, Vol. 1, Issue 4 https://doi.org/10.1038/natrevmats.2016.17	journal	March 2016
Gradual enhancement of stripe-type antiferromagnetism in the spin-ladder material ${BaFe}_{2} S_{3}$ under pressure Zheng, Liangliang; Frandsen, Benjamin A.; Wu, Changwei Physical Review B, Vol. 98, Issue 18 https://doi.org/10.1103/physrevb.98.180402	journal	November 2018
Bandwidth and Electron Correlation-Tuned Superconductivity in ${Rb}_{0.8} {Fe}_{2} ({Se}_{1 - z} S_{z})_{2}$ Yi, M.; Wang, Meng; Kemper, A. F. Physical Review Letters, Vol. 115, Issue 25 https://doi.org/10.1103/physrevlett.115.256403	journal	December 2015
Antiferromagnetic order and spin dynamics in iron-based superconductors Dai, Pengcheng arXiv https://doi.org/10.48550/arxiv.1503.02340	text	January 2015
High Temperature Superconductivity in Iron Pnictides and Chalcogenides Si, Qimiao; Yu, Rong; Abrahams, Elihu arXiv https://doi.org/10.48550/arxiv.1604.03566	text	January 2016
Block antiferromagnetism and possible ferroelectricity in KFe$_2$Se$_2$ Zhang, Yang; Zhang, Huimin; Weng, Yakui arXiv https://doi.org/10.48550/arxiv.1609.02614	text	January 2016

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