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Title: Survey of the class of isovalent antiperovskite alkaline-earth pnictide compounds

Journal Article · · Physical Review B
 [1];  [1]
  1. Univ. of California, Davis, CA (United States). Dept. of Physics

The few reported members of the antiperovskite structure class $$Ae_3Pn_APn_B$$ of alkaline earth $(Ae = Ca$,Sr,Ba) pnictides $(Pn = N$,P,As,Sb,Bi) compounds are all based on the $$B$$-site anion $$Pn_B$$ = N. All fit can be categorized as narrow gap semiconductors, making them of interest for several reasons. Because chemical reasoning suggests that more members of this class may be stable, we provide here a density functional theory (DFT) based survey of this entire class of 3 x 5 x 5 compounds. We determine first the relative energetic stability of the distribution of pairs of $Pn$ ions in the $$A$$ and $$B$$ sites of the structure, finding that the $$B$$ site always favors the small pnictogen anion. The trends of the calculated energy gaps with $Ae$ cation and $Pn$ anions are determined, and we study effects of spin-orbit coupling as well as two types of gap corrections to the conventional DFT electronic spectrum. Because there have been suggestions that this class harbors topological insulating phases, we have given this possibility attention and found that energy gap corrections indicate the cubic structures will provide at most a few topological insulators. Structural instability is addressed by calculating phonon dispersion curves for a few compounds, with one outcome being that distorted structures should be investigated further for thermoelectric and topological character. Examples of the interplay between spin-orbit coupling and strain on the topological nature are provided. Finally, a case study of $$Ca_3BiP$$ including the effect of strain illustrates how a topological semimetal can be transformed into topological insulator and Dirac semimetal.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1544339
Alternate ID(s):
OSTI ID: 1415669
Journal Information:
Physical Review B, Vol. 97, Issue 3; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (6)

Metal-Rich Ternary Perovskite Nitrides: Metal-Rich Ternary Perovskite Nitrides journal August 2019
Weyl nodes and magnetostructural instability in antiperovskite Mn 3 ZnC journal December 2019
Coemergence of Dirac and multi-Weyl topological excitations in pnictide antiperovskites journal September 2018
Computational search for Dirac and Weyl nodes in f -electron antiperovskites journal May 2019
Metal-rich ternary perovskite nitrides collection January 2019
Computational search for Dirac and Weyl nodes in $f$-electon antiperovskites text January 2019

Figures / Tables (11)


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