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- Title
A new topological semimetal candidate: SmMnBi<sub>2</sub>.
- Authors
Krishnan, Sudha; Besara, Tiglet
- Abstract
The new compound SmMnBi2 has been synthesized by the self‐flux method and shown to crystallize in space group I4/mmm with a = 4.5054 (4) Å, c = 20.5914 (19) Å and Z = 4. Its structure comprises two‐dimensional square Mn‐nets layers, puckered rock‐salt‐like SmBi slabs and two‐dimensional square Bi‐nets layers, alternating along the c axis in an ...Mn‐net–SmBi slab–Bi‐net–SmBi slab–Mn‐net... sequence. Surprisingly, the atomic arrangement differs from its neighboring compound EuMnBi2 which has similar layers but with a different stacking arrangement. This gives rise to edge‐shared square planar MnBi4 polyhedral layers in SmMnBi2 while EuMnBi2 has edge‐shared MnBi4 tetrahedral layers. The MMnX2 (M = alkaline earth/rare earth metals, X = Sb/Bi) family has emerged as topological Dirac or Weyl semimetal candidates, all of them sharing similar structural features. Although SmMnBi2 has a different stacking arrangement to EuMnBi2, its layer structure still makes it a topological Dirac or Weyl semimetal candidate.
- Subjects
SEMIMETALS; RARE earth metals; SPACE groups
- Publication
Acta Crystallographica Section B: Structural Science, Crystal Engineering & Materials, 2021, Vol 77, Issue 4, p577
- ISSN
2052-5192
- Publication type
Article
- DOI
10.1107/S2052520621005849