Controlling magnetic order, magnetic anisotropy, and band topology in the semimetals Sr(Mn0.9Cu0.1)Sb-2 and Sr(Mn0.9Zn0.1)Sb-2 Islam, Farhan Choudhary, Renu Liu, Yong Ueland, Benjamin Paudyal, Durga Heitmann, Thomas McQueeney, Robert Vaknin, David
dc.contributor.department Ames Laboratory
dc.contributor.department Physics and Astronomy 2020-10-30T18:06:26.000 2021-02-24T20:26:37Z 2021-02-24T20:26:37Z 2021-08-14 2020-08-14
dc.description.abstract <p>Neutron diffraction and magnetic susceptibility studies show that orthorhombic single-crystals of topological semimetals Sr(Mn0.9Cu0.1)Sb-2 and Sr(Mn0.9Zn0.1)Sb-2 undergo three-dimensional C-type antiferromagnetic (AFM) ordering of the Mn2+ moments at T-N = 200 +/- 10 and 210 +/- 12 K, respectively, significantly lower than that of the parent SrMnSb2 with T-N = 297 +/- 3 K. Magnetization versus applied magnetic field (perpendicular to MnSb planes) below T-N exhibits slightly modified de Haas van Alphen oscillations for the Zn-doped crystal as compared to that of the parent compound. By contrast, the Cu-doped system does not show de Haas van Alphen magnetic oscillations, suggesting that either Cu substitution for Mn changes the electronic structure of the parent compound substantially, or that the Cu sites are strong scatterers of carriers that significantly shorten their mean free path thus diminishing the oscillations. Density functional theory (DFT) calculations including spin-orbit coupling predict the C-type AFM state for the parent, Cu-, and Zn-doped systems and identify the a-axis (i.e., perpendicular to the Mn layer) as the easy magnetization direction in the parent and 12.5% of Cu or Zn substitutions. In contrast, 25% of Cu content changes the easy magnetization to the b-axis (i.e., within the Mn layer). We find that the incorporation of Cu and Zn in SrMnSb2 tunes electronic bands near the Fermi level resulting in different band topology and semimetallicity. The parent and Zn-doped systems have coexistence of electron and hole pockets with opened Dirac cone around the Y-point whereas the Cu-doped system has dominant hole pockets around the Fermi level with a distorted Dirac cone. The tunable electronic structure may point out possibilities of rationalizing the experimentally observed de Haas van Alphen magnetic oscillations.</p>
dc.identifier archive/
dc.identifier.articleid 1709
dc.identifier.contextkey 20028516
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ameslab_manuscripts/706
dc.language.iso en
dc.relation.ispartofseries IS-J 10297
dc.source.bitstream archive/|||Sat Jan 15 01:41:22 UTC 2022
dc.source.uri 10.1103/PhysRevB.102.085130
dc.subject.disciplines Condensed Matter Physics
dc.title Controlling magnetic order, magnetic anisotropy, and band topology in the semimetals Sr(Mn0.9Cu0.1)Sb-2 and Sr(Mn0.9Zn0.1)Sb-2
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
relation.isOrgUnitOfPublication 4a05cd4d-8749-4cff-96b1-32eca381d930
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