TY - JOUR
T1 - Influence of magnetism on Dirac semimetallic behavior in nonstoichiometric Sr1-yMn1-zSb2 (y∼0.07,z∼0.02)
AU - Zhang, Qiang
AU - Okamoto, Satoshi
AU - Stone, Matthew B.
AU - Liu, Jinyu
AU - Zhu, Yanglin
AU - Ditusa, John
AU - Mao, Zhiqiang
AU - Tennant, David Alan
N1 - Funding Information:
Primary support for this study came from the U.S. Department of Energy under EPSCoR Grant No. DESC0012432, with additional support from the Louisiana Board of Regents. A portion of this research used resources at Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The research by SO and DAT was sponsored by the Laboratory Directed Research and Development Program (LDRD) of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy. This manuscript has been partially supported by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan [28] .
Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/11/5
Y1 - 2019/11/5
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevB.100.205105
DO - 10.1103/PhysRevB.100.205105
M3 - Article
AN - SCOPUS:85075319742
SN - 2469-9950
VL - 100
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 20
M1 - 205105
ER -