Unique [Mn6Bi5]- Nanowires in KMn6Bi5: A Quasi-One-Dimensional Antiferromagnetic Metal

Jin Ke Bao, Zhang Tu Tang, Hee Joon Jung, Ji Yong Liu, Yi Liu, Lin Li, Yu Ke Li, Zhu An Xu, Chun Mu Feng, Haijie Chen, Duck Young Chung, Vinayak P. Dravid, Guang Han Cao*, Mercouri G. Kanatzidis

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

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. 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.

Original languageEnglish (US)
Pages (from-to)4391-4400
Number of pages10
JournalJournal of the American Chemical Society
Volume140
Issue number12
DOIs
StatePublished - Mar 28 2018

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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    Bao, J. K., Tang, Z. T., Jung, H. J., Liu, J. Y., Liu, Y., Li, L., Li, Y. K., Xu, Z. A., Feng, C. M., Chen, H., Chung, D. Y., Dravid, V. P., Cao, G. H., & Kanatzidis, M. G. (2018). Unique [Mn6Bi5]- Nanowires in KMn6Bi5: A Quasi-One-Dimensional Antiferromagnetic Metal. Journal of the American Chemical Society, 140(12), 4391-4400. https://doi.org/10.1021/jacs.8b00465