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CsMn4As3: A Layered Tetragonal Transition-Metal Pnictide Compound with an Antiferromagnetic Ground State

TitleCsMn4As3: A Layered Tetragonal Transition-Metal Pnictide Compound with an Antiferromagnetic Ground State
Publication TypeJournal Article
Year of Publication2018
AuthorsPandey, A, Samal, SL, Johnston, DC
JournalInorganic Chemistry
Date Published03
Type of ArticleArticle
ISBN Number0020-1669
Accession NumberWOS:000428219500032
Keywordschemistry, crystalline, magnetic-properties, mnas, phase

We report the synthesis and properties of a new layered tetragonal ternary compound CsMn4As3 (structure type, KCu4S3; space group, P4/mmm, no. 123; and Z = 2). The material is a small band gap semiconductor and exhibits an antiferromagnetic ground state associated with Mn spins. The compound exhibits a signature of a distinct magnetic moment canting event at 150(5) K with a canting angle approximate to 0.3 degrees. Although some features of the magnetic characteristics of this new compound are qualitatively similar to those of the related BaMn2As2, the underlying Mn sublattices of the two materials are quite different. While the Mn square-lattice layers in BaMn2As2 are equally spaced along the c-direction with the interlayer distance d(L) (Ba) = 6.7341(4) angstrom, the Mn sublattice forms bilayers in CsMn4As3 with the interlayer distance within a bilayer being d(L Cs) = 3.1661(6) angstrom; the distance between the two adjacent bilayers is d(B) = 7.290(6) angstrom. This difference in the Mn sublattice is bound to significantly alter the energy balance among the J(v), J(2), and J(c) exchange interactions within the J(1)-J(2)-J(c) model compared to those in BaMn2As2 and the other related 122 compounds, including the well-known iron arsenide superconductor parent compound BaFe2As2. Owing to the novelty of its transition-metal sublattice, this new addition to the family of tetragonal materials related to the iron-based superconductors brings prospects for doping and pressure studies in the search of new superconducting phases as well as other exciting correlated electron properties.

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