Unique [Mn6Bi5]- Nanowires in KMn6Bi5: A Quasi-One-Dimensional Antiferromagnetic Metal
- Zhejiang Univ., Hangzhou (China). Dept. of Physics; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
- Zhejiang Univ., Hangzhou (China). Dept. of Physics
- Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
- Zhejiang Univ., Hangzhou (China). Dept. of Chemistry
- Hangzhou Normal Univ. (China). Dept. of Physics
- Zhejiang Univ., Hangzhou (China). Dept. of Physics. State Key Lab. of Silicon Materials; Nanjing Univ. (China). Collaborative Innovation Centre of Advanced Microstructures
- Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
- Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
- Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
In this paper, we report a new quasi-one-dimensional compound KMn6Bi5 composed of parallel nanowires crystallizing in a monoclinic space group C2/m with a = 22.994(2) Å, b = 4.6128(3) Å, c = 13.3830(13) Å and β = 124.578(6)°. The nanowires are infinite [Mn6Bi5]- columns each of which is composed of a nanotube of Bi atoms acting as the cladding with a nanorod of Mn atoms located in the central axis of the nanotubes. The nanorods of Mn atoms inside the Bi cladding are stabilized by Mn–Mn bonding and are defined by distorted Mn-centered cluster icosahedra of Mn13 sharing their vertices along the b axis. The [Mn6Bi5]- nanowires are linked with weak internanowire Bi–Bi bonds and charge balanced with K+ ions. The [Mn6Bi5]- nanowires were directly imaged by high-resolution transmission electron microscopy and scanning transmission electron microscopy. Magnetic susceptibility studies show one-dimensional characteristics with an antiferromagnetic transition at ~75 K and a small average effective magnetic moment (1.56 μB/Mn for H ∥ b and 1.37 μB/Mn for H ⊥ b) of Mn from Curie–Weiss fits above 150 K. Specific heat measurements reveal an electronic specific heat coefficient γ of 6.5(2) mJ K–2(mol-Mn)-1 and a small magnetic entropy change ΔSmag ≈ 1.6 J K–1 (mol-Mn)-1 across the antiferromagnetic transition. Finally, in contrast to a metallic resistivity along the column, the resistivity perpendicular to the column shows a change from a semiconducting behavior at high temperatures to a metallic one at low temperatures, indicating an incoherent-to-coherent crossover of the intercolumn tunneling of electrons.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States); Zhejiang Univ., Hangzhou (China)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC); National Key Research and Development Program of China
- Grant/Contract Number:
- AC02-06CH11357; ECCS-1542205; DMR-1720139; 11674281; 2017YFA0303002
- OSTI ID:
- 1433916
- Journal Information:
- Journal of the American Chemical Society, Vol. 140, Issue 12; ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
A Design Criteria to Achieve Giant Ising‐Type Anisotropy in Co II ‐Encapsulated Metallofullerenes
|
journal | November 2019 |
Origin of structural stability of ScH 3 molecular nanowires and their chemical-bonding behavior: Correlation effects of the Sc 3d electrons
|
journal | May 2019 |
Similar Records
Unconventional Defects in a Quasi-One-Dimensional KMn6Bi5
Quasi-One-Dimensional Structure and Possible Helical Antiferromagnetism of RbMn6Bi5