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Title: Magnetic order effects on the electronic structure of K M MnS 2 ( M = Cu , Li ) with the ThCr 2 Si 2 -type structure

Journal Article · · Physical Review Materials
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  1. Univ. of Maryland, College Park, MD (United States)
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

We study the relationship between antiferromagnetic order and the electronic properties of KCuMnS2 with the ThCr2Si2-type structure. We propose two magnetic structures for KCuMnS2 with the ThCr2Si2-type structure. Powder samples of KCuMnS2 and KLiMnS2 were prepared for structural studies and magnetization measurements. In both compounds, the Mn2+ site is alloyed by either Cu+ or Li+. We also prepared single crystals of KCuMnS2 for x-ray and neutron-diffraction studies and resistivity measurements. We relate these properties to the electronic structure calculated with density functional theory. Neutron-diffraction studies reveal that KCuMnS2 exhibits long-range magnetic ordering with a Néel temperature near 160 K and a moment of 0.92(2) μB/Mn2+ at 6 K. In contrast, KLiMnS2 never exhibits long-range magnetic ordering down to 3.5 K. Here, both sulfides never display a crystallographic phase transition from our temperature-dependent x-ray and neutron-diffraction studies. We discuss the magnetic phases in detail and how they relate to isostructural phases such as iron-based superconductors and related chalcogenides. Electrical resistance measurements indicate that while KCuMnS2 is semiconducting, there is an anomaly around the Néel temperature, which indicates that long-range magnetism influences its electronic structure.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1559589
Journal Information:
Physical Review Materials, Vol. 3, Issue 4; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

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