Influence of magnetism on Dirac semimetallic behavior in nonstoichiometric Sr1-yMn1-zSb2 (y∼0.07,z∼0.02)

Qiang Zhang, Satoshi Okamoto, Matthew B. Stone, Jinyu Liu, Yanglin Zhu, John Ditusa, Zhiqiang Mao, David Alan Tennant

Research output: Contribution to journalArticle

Abstract

Nonstoichiometric Sr1-yMn1-zSb2(y,z<0.1) is known to exhibit a coexistence of magnetic order and the nontrivial semimetallic behavior. In this paper, we report the magnetism and its strong coupling to the semimetallic behavior, by a combined use of inelastic neutron scattering (INS) and density functional theory (DFT). A phase separation consisting of a majority antiferromagentic phase and a minority ferromagnetic phase is proposed. We found a relatively large spin excitation gap ≈8.5meV at 5 K, and the interlayer magnetic exchange constant only 2.8% of the dominant intralayer magnetic interaction, evidencing a quasi-2D magnetism in Sr1-yMn1-zSb2. Using DFT, we find a strong influence of magnetic orders on the electronic band structure and the Dirac dispersions near the Fermi level along the Y-S direction in the presence of a ferromagnetic order. Furthermore, we demonstrate that the size of the ferromagnetic ordered moment is an effective strategy to tune Dirac/Weyl dispersions near the Fermi level. Our study unveils novel interplay between the magnetic order, ordered moment, and electronic band topology in Sr1-yMn1-zSb2 and opens pathways to control the relativistic band structure.

Original languageEnglish (US)
Article number205105
JournalPhysical Review B
Volume100
Issue number20
DOIs
StatePublished - Nov 5 2019

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Magnetism
Fermi level
Dispersions
Band structure
Density functional theory
Inelastic neutron scattering
Phase separation
density functional theory
moments
Topology
minorities
electronics
interlayers
inelastic scattering
neutron scattering
topology
excitation
interactions
Direction compound

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Zhang, Q., Okamoto, S., Stone, M. B., Liu, J., Zhu, Y., Ditusa, J., ... Tennant, D. A. (2019). Influence of magnetism on Dirac semimetallic behavior in nonstoichiometric Sr1-yMn1-zSb2 (y∼0.07,z∼0.02). Physical Review B, 100(20), [205105]. https://doi.org/10.1103/PhysRevB.100.205105
Zhang, Qiang ; Okamoto, Satoshi ; Stone, Matthew B. ; Liu, Jinyu ; Zhu, Yanglin ; Ditusa, John ; Mao, Zhiqiang ; Tennant, David Alan. / Influence of magnetism on Dirac semimetallic behavior in nonstoichiometric Sr1-yMn1-zSb2 (y∼0.07,z∼0.02). In: Physical Review B. 2019 ; Vol. 100, No. 20.
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abstract = "Nonstoichiometric Sr1-yMn1-zSb2(y,z<0.1) is known to exhibit a coexistence of magnetic order and the nontrivial semimetallic behavior. In this paper, we report the magnetism and its strong coupling to the semimetallic behavior, by a combined use of inelastic neutron scattering (INS) and density functional theory (DFT). A phase separation consisting of a majority antiferromagentic phase and a minority ferromagnetic phase is proposed. We found a relatively large spin excitation gap ≈8.5meV at 5 K, and the interlayer magnetic exchange constant only 2.8{\%} of the dominant intralayer magnetic interaction, evidencing a quasi-2D magnetism in Sr1-yMn1-zSb2. Using DFT, we find a strong influence of magnetic orders on the electronic band structure and the Dirac dispersions near the Fermi level along the Y-S direction in the presence of a ferromagnetic order. Furthermore, we demonstrate that the size of the ferromagnetic ordered moment is an effective strategy to tune Dirac/Weyl dispersions near the Fermi level. Our study unveils novel interplay between the magnetic order, ordered moment, and electronic band topology in Sr1-yMn1-zSb2 and opens pathways to control the relativistic band structure.",
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Influence of magnetism on Dirac semimetallic behavior in nonstoichiometric Sr1-yMn1-zSb2 (y∼0.07,z∼0.02). / Zhang, Qiang; Okamoto, Satoshi; Stone, Matthew B.; Liu, Jinyu; Zhu, Yanglin; Ditusa, John; Mao, Zhiqiang; Tennant, David Alan.

In: Physical Review B, Vol. 100, No. 20, 205105, 05.11.2019.

Research output: Contribution to journalArticle

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AU - Tennant, David Alan

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