Quantum oscillations and Dirac dispersion in the 
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 semimetal guaranteed by local Zn vacancy order

Zhao, Keyi; Golias, E.; Zhang, Q. H.; Krivenkov, Maxim; Jesche, Anton; Gu, Lin; Rader, O.; Mazin, I. I.; Gegenwart, P.

doi:10.1103/physrevb.97.115166

Cited by 19 publications

(16 citation statements)

References 42 publications

(120 reference statements)

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“…For comparison, we discuss these results in relation to similar studies of the BaZnBi 2 compound [43]. BaZnBi 2 has a space group I4/mmm, and c axis is perpendicular to the Zn layers.…”

Section: E Transmission Electron Microscopy (Tem)mentioning

confidence: 69%

“…In this symmetry, (0,0,2l + 1) peaks are not allowed; however, they appear in the XRD pattern. Zhao et al employed atomic resolution scanning transmission electron microscopy (STEM) to directly probe the modulated structure of BaZnBi 2 in real space [43] and found that the ordering of Zn vacancies appears in every second Zn layer in [1,1,0] cross section. The Zn vacancy ordering has a local character and is not uniform in BaZnBi 2 .…”

Section: E Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

“…In the case of vacancies, the FS becomes considerably altered, while the effect of stacking faults on the electronic structure is to allow the Weyl pockets to remain close to the FS. The observation of quantum oscillations in the defective crystals such as TaAs, BaZnBi 2 , and SrMnSb 2 suggests the robustness of the quantum phenomena in these materials to stacking faults [43,44]. Figure 16 displays the TEM results on the Batch B crystal that was viewed along [0,1,0] zone axis.…”

Section: E Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

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Crystal growth, microstructure, and physical properties of SrMnSb2

Liu

Zhou

et al. 2019

Phys. Rev. B

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We report on the crystal and magnetic structures, magnetic, and transport properties of SrMnSb2 single crystals grown by the self-flux method. Magnetic susceptibility measurements reveal an antiferromagnetic (AFM) transition at TN = 295(3) K. Above TN, the susceptibility slightly increases and forms a broad peak at T ∼ 420 K, which is a typical feature of two-dimensional magnetic systems. Neutron diffraction measurements on single crystals confirm the previously reported C-type AFM structure below TN. Both de Haas-van Alphen (dHvA) and Shubnikov-de Haas (SdH) effects are observed in SrMnSb2 single crystals. Analysis of the oscillatory component by a Fourier transform shows that the prominent frequencies obtained by the two different techniques are practically the same within error regardless of sample size or saturated magnetic moment. Transmission electron microscopy (TEM) reveals the existence of stacking faults in the crystals, which result from a horizontal shift of Sb atomic layers suggesting possible ordering of Sb vacancies in the crystals. Increase of temperature in susceptibility measurements leads to the formation of a strong peak at T ∼ 570 K that upon cooling under magnetic field the susceptibility shows a ferromagnetic transition at TC ∼ 580 K. Neutron powder diffraction on crushed single-crystals does not support an FM phase above TN. Furthermore, X-ray magnetic circular dichroism (XMCD) measurements of a single crystal at the L2,3 edge of Mn shows a signal due to induced canting of AFM moments by the applied magnetic field. All evidence strongly suggests that a chemical transformation at the surface of single crystals occurs above 500 K concurrently producing a minute amount of ferromagnetic impurity phase. * yongliu31@outlook.com † vaknin@ameslab.gov arXiv:1902.04948v1 [cond-mat.mtrl-sci]

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“…For comparison, we discuss these results in relation to similar studies of the BaZnBi 2 compound [43]. BaZnBi 2 has a space group I4/mmm, and c axis is perpendicular to the Zn layers.…”

Section: E Transmission Electron Microscopy (Tem)mentioning

confidence: 69%

Section: E Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

Section: E Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

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Crystal growth, microstructure, and physical properties of SrMnSb2

Liu

Zhou

et al. 2019

Phys. Rev. B

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“…Weyl states were proposed in Sr 1−y Mn 1−z Sb 2 and YbMnBi 2 [44,45]. Topological Dirac states were also found in Zn-based 112 materials such as BaZnBi 2 and SrZnSb 2 [46,47]; EuMnBi 2 hosts QHE with field-tunable Eu 4 f magnetic order and magnetopiezoelectric effect [48,49].…”

Section: Resultsmentioning

confidence: 97%

Magnetic mixed valent semimetal EuZnSb2 with Dirac states in the band structure

Wang

Baranets

Liu

et al. 2020

Phys. Rev. Research

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We report discovery of antiferromagnetic semimetal EuZnSb 2 , obtained and studied in the form of single crystals. Electric resistivity, magnetic susceptibility, and heat capacity indicate antiferromagnetic order of Eu with T N = 20 K. The effective moment of Eu 2+ inferred from the magnetization and specific heat measurement is 3.5 μ B , smaller than the theoretical value of Eu 2+ due to presence of both Eu 3+ and Eu 2+. Magnetic-fielddependent resistivity measurements suggest dominant quasi-two-dimensional Fermi surfaces whereas the firstprinciple calculations point to the presence of Dirac fermions. Therefore, EuZnSb 2 could represent the first platform to study the interplay of dynamical charge fluctuations, localized magnetic 4 f moments, and Dirac states with Sb orbital character.

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“…Consequently, nodal lines or points are apparent in the band structure, as has been previously reported. [57][58][59][60][61][62][63][64][65][66]…”

Section: B Kcu2eute4mentioning

confidence: 99%

Systematic study of stacked square nets: From Dirac fermions to material realizations

2020

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Non-symmorphic symmetries protect Dirac line nodes in square net materials. This phenomenon has been most prominently observed in ZrSiS. Here, we systematically study the symmetry-protected nodal fermions that result from different ways of embedding the square net into a larger unit cell. Surprisingly, we find that a nonsymmorphic space group is not a necessary condition for a filling enforced semimetal: symmorphic space groups can also host nodal fermions that are enforced by band folding and electron count, that is, a combination of a particular structural motif combined with electron filling. We apply the results of this symmetry analysis to define an algorithm, which we utilize to find square net materials with nodal fermions in specific symmorphic space groups. We highlight one result of this search, the compound ThGeSe, which has not been discussed before in the context of nodal fermions. Finally, we discuss how band folding can impose constraints on band connectivity beyond the connectivity of single elementary band representations.

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Quantum oscillations and Dirac dispersion in the BaZnBi2 semimetal guaranteed by local Zn vacancy order

Cited by 19 publications

References 42 publications

Crystal growth, microstructure, and physical properties of SrMnSb2

Crystal growth, microstructure, and physical properties of SrMnSb2

Magnetic mixed valent semimetal EuZnSb2 with Dirac states in the band structure

Systematic study of stacked square nets: From Dirac fermions to material realizations

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