Magnetic and electronic structures of antiferromagnetic topological material candidate EuMg2Bi2

Marshall, Milton V.; Pletikosić, Ivo; Yahyavi, Mohammad; Tien, Hung-Ju; Chang, Tay Rong; Cao, Huibo; Xie, Weiwei

doi:10.1063/5.0035703

Cited by 26 publications

(20 citation statements)

References 49 publications

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“…The room temperature resistivity value of 0.43 mΩ cm is large. Such large values were reported in other Eu-based magnetically ordered topological materials like EuMg 2 Bi 2 [47] and EuCd 2 As 2 [48], also in isostructural topological materials like BaAuAs and BaAgAs [49]. Down to about 40 K, the resistivity decreases with decreasing temperature in a metallic manner, then rapidly increases and saturates below 6 K (see also the inset to Fig.…”

Section: Magnetotransportsupporting

confidence: 67%

Electronic structure and physical properties of EuAuAs single crystal

et al. 2022

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High-quality single crystals of EuAuAs were studied by means of powder x-ray diffraction, magnetization, magnetic susceptibility, heat capacity, electrical resistivity and magnetoresistance measurements. The compound crystallizes with a hexagonal structure of the ZrSiBe type (space group P 63/mmc). It orders antiferromagnetically below 6 K due to the magnetic moments of divalent Eu ions. The electrical resistivity exhibits metallic behavior down to 40 K, followed by a sharp increase at low temperatures. The magnetotransport isotherms show a distinct metamagnetic-like transition in concert with the magnetization data. The antiferromagnetic ground state in EuAuAs was corroborated in the ab initio electronic band structure calculations. Most remarkably, the calculations revealed the presence of nodal line without spin-orbit coupling and Dirac point with inclusion of spin-orbit coupling. The Z 2 invariants under the effective time reversal and inversion symmetries make this system nontrivial topological material. Our findings, combined with experimental analysis, makes EuAuAs a plausible candidate for an antiferromagnetic topological nodal-line semimetal.

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Section: Magnetotransportsupporting

confidence: 67%

Electronic structure and physical properties of EuAuAs single crystal

et al. 2022

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“…In BaMg 2 Bi 2 crystal, Ba atoms can be easily replaced with other elements, and its general chemical composition is expressed as X Mg 2 Bi 2 where X represents alkaline earth or rare earth metal (Ca, Sr, Ba, Yb, Eu, etc.) 31 – 35 . X Mg 2 Bi 2 crystalizes in the CaAl 2 Si 2 -type structure (space group of P m1, No.…”

Section: Introductionmentioning

confidence: 99%

Dirac semimetal phase and switching of band inversion in XMg2Bi2 (X = Ba and Sr)

Takane

Kubota

Nakayama

et al. 2021

Sci Rep

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Topological Dirac semimetals (TDSs) offer an excellent opportunity to realize outstanding physical properties distinct from those of topological insulators. Since TDSs verified so far have their own problems such as high reactivity in the atmosphere and difficulty in controlling topological phases via chemical substitution, it is highly desirable to find a new material platform of TDSs. By angle-resolved photoemission spectroscopy combined with first-principles band-structure calculations, we show that ternary compound BaMg2Bi2 is a TDS with a simple Dirac-band crossing around the Brillouin-zone center protected by the C3 symmetry of crystal. We also found that isostructural SrMg2Bi2 is an ordinary insulator characterized by the absence of band inversion due to the reduction of spin–orbit coupling. Thus, XMg2Bi2 (X = Sr, Ba, etc.) serves as a useful platform to study the interplay among crystal symmetry, spin–orbit coupling, and topological phase transition around the TDS phase.

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“…In recent years, studies of Eu-based intermetallic compounds carried out in the search for novel electronic states have been reported [9][10][11][12]. EuMg 2 Bi 2 is one such material which belongs to a class of rare-earth-based compounds that exhibit novel electronic states arising from a complex interplay of magnetism and electronband topology [13][14][15]. It has recently gained interest because it possesses Dirac points located at different energies with respect to the Fermi energy [13].…”

Section: Introductionmentioning

confidence: 99%

A-type antiferromagnetic order in semiconducting EuMg$_2$Sb$_2$ single crystals

Pakhira,

Islam,

O'Leary

et al. 2022

Preprint

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Eu-based Zintl-phase materials EuA2P n2 (A = Mg, In, Cd, Zn; P n = Bi, Sb, As, P) have generated significant recent interest owing to the complex interplay of magnetism and band topology. Here, we investigated the electronic, magnetic, and electronic properties of the layered Zintl-phase single crystals of EuMg2Sb2 with the trigonal CaAl2Si2 crystal structure (space group P 3m1). Electrical resistivity measurements complemented with angle-resolved photoemission spectroscopy (ARPES) studies find an activated behavior with the intrinsic conductivity at high temperatures indicating a semiconducting electronic ground state with a narrow energy gap of 370 meV. Magnetic susceptibility and zero-field heat-capacity measurements indicate that the compound undergoes antiferromagnetic (AFM) ordering at the Néel temperature TN = 8.0(2) K. Zero-field neutrondiffraction measurements reveal that the AFM ordering is A-type where the Eu ordered moments (Eu 2+ , S = 7/2) arranged in ab-plane layers are aligned ferromagnetically in the ab plane with the Eu moments in adjacent layers aligned antiferromagnetically. We also find that Eu-moment reorientation in the trigonal AFM domains within the ab planes occurs below below TN at low fields < 0.05 T due to very small in-plane anisotropy. Although isostructural semimetallic EuMg2Bi2 is reported to host Dirac surface states, the observation of narrow-gap semiconducting behavior in EuMg2Sb2 implies a strong role of spin-orbit coupling in tuning the electronic states of these materials.

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Magnetic and electronic structures of antiferromagnetic topological material candidate EuMg2Bi2

Cited by 26 publications

References 49 publications

Electronic structure and physical properties of EuAuAs single crystal

Electronic structure and physical properties of EuAuAs single crystal

Dirac semimetal phase and switching of band inversion in XMg2Bi2 (X = Ba and Sr)

A-type antiferromagnetic order in semiconducting EuMg$_2$Sb$_2$ single crystals

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