Two spatially separated phases in semiconducting
Abstract
We report neutron scattering and transport measurements on semiconducting Rb0.8Fe1.5S2, a compound isostructural and isoelectronic to the well-studied A0.8FeySe2(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 TN = 425 K and an iron vacancy order-disorder transition at TS = 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 Rb0.8Fe1.5S2 and K0.81Fe1.58Se2, we argue that the in-plane antiferromagnetic order arises from strong coupling between local moments. Superconductivity, previously observed in the A0.8FeySe2₋ zSz system, is absent in A0.8Fe1.5S2, 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 furthermore »
- Authors:
-
- 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
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1159437
- Alternate Identifier(s):
- OSTI ID: 1180514
- Grant/Contract Number:
- AC05-00OR22725; AC02-05CH11231; AC03-76SF008; DMR-1362219
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 90; Journal Issue: 12; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Wang, Meng, Tian, Wei, Valdivia, P., Chi, Songxue, Bourret-Courchesne, E., Dai, Pengcheng, and Birgeneau, R. J. Two spatially separated phases in semiconducting Rb0.8Fe1.5S2. United States: N. p., 2014.
Web. doi:10.1103/PhysRevB.90.125148.
Wang, Meng, Tian, Wei, Valdivia, P., Chi, Songxue, Bourret-Courchesne, E., Dai, Pengcheng, & Birgeneau, R. J. Two spatially separated phases in semiconducting Rb0.8Fe1.5S2. United States. https://doi.org/10.1103/PhysRevB.90.125148
Wang, Meng, Tian, Wei, Valdivia, P., Chi, Songxue, Bourret-Courchesne, E., Dai, Pengcheng, and Birgeneau, R. J. 2014.
"Two spatially separated phases in semiconducting Rb0.8Fe1.5S2". United States. https://doi.org/10.1103/PhysRevB.90.125148. https://www.osti.gov/servlets/purl/1159437.
@article{osti_1159437,
title = {Two spatially separated phases in semiconducting Rb0.8Fe1.5S2},
author = {Wang, Meng and Tian, Wei and Valdivia, P. and Chi, Songxue and Bourret-Courchesne, E. and Dai, Pengcheng and Birgeneau, R. J.},
abstractNote = {We report neutron scattering and transport measurements on semiconducting Rb0.8Fe1.5S2, a compound isostructural and isoelectronic to the well-studied A0.8FeySe2(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 TN = 425 K and an iron vacancy order-disorder transition at TS = 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 Rb0.8Fe1.5S2 and K0.81Fe1.58Se2, we argue that the in-plane antiferromagnetic order arises from strong coupling between local moments. Superconductivity, previously observed in the A0.8FeySe2₋ zSz system, is absent in A0.8Fe1.5S2, 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.},
doi = {10.1103/PhysRevB.90.125148},
url = {https://www.osti.gov/biblio/1159437},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 12,
volume = 90,
place = {United States},
year = {Fri Sep 26 00:00:00 EDT 2014},
month = {Fri Sep 26 00:00:00 EDT 2014}
}
Web of Science
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