Large negative magnetoresistance of a nearly Dirac material: Layered antimonide 
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Yi, Changjiang; Yang, Shuai; Yang, Meng; Wang, Le; Matsushita, Yoshitaka; Miao, Shiding; Jiao, Yuanyuan; Cheng, Jinguang; Li, Yongqing; Yamaura, Kazunari; Shi, Youguo; Luo, Jianlin

doi:10.1103/physrevb.96.205103

Cited by 67 publications

(63 citation statements)

References 41 publications

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“…The effective moments of Eu 2+ obtained in a usual manner (μ eff = 3k B •C nμ B ) are 7.77 μ B (H a) and 8.57 μ B (H c) respectively, which are quite reasonable given that the theoretical value is 7.94 μ B for Eu 2+ (4 f 7 ). The obtained effective moments along the c axis (easy axis here) is a little bit larger than the theoretical one, and similar results were also seen in the previously reported works (e.g., EuMnSb 2 , 8.0 μ B [43]; EuMnBi 2 , 8.1 μ B [39]). One possible explanation for this is a non-negligible Curie-Weiss contribution from the Mn moments since they may not be completely saturated in this temperature regime.…”

Section: A X-ray Diffraction and Magnetic Propertiessupporting

confidence: 90%

Magnetic structures, spin-flop transition, and coupling of Eu and Mn magnetism in the Dirac semimetal EuMnBi2

Zhu

Wang

Meven

et al. 2020

Phys. Rev. Research

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Section: A X-ray Diffraction and Magnetic Propertiessupporting

confidence: 90%

Magnetic structures, spin-flop transition, and coupling of Eu and Mn magnetism in the Dirac semimetal EuMnBi2

Zhu

Wang

Meven

et al. 2020

Phys. Rev. Research

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“…3(a) inset]. The resistivity is similar to that of AZnSb 2 (A = Ba and Sr) and EuZnBi 2 , but is in contrast to semiconducting EuMnSb 2 [60][61][62]. Since MR is determined by the extremal cross section of the Fermi surface perpendicular to the magnetic field direction, information about geometric structure of Fermi surface can be obtained from the angular dependence of MR. As shown in Fig.…”

Section: Resultsmentioning

confidence: 94%

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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“…with the associated basis vectors listed in Table I (the Miller and Love notation is adopted 38 ). In both cases, the irreps which describe the ferromagnetic sublattices with moments along x, y and z, namely Γ + 3 , Γ + 4 and Γ + 2 , can be excluded by the bulk magnetization 20 . We consider all of the remaining irreps for the Eu and Mn sublattices systematically and discuss the magnetism on each in turn.…”

mentioning

confidence: 99%

Magnetic and electronic structure of Dirac semimetal candidate EuMnSb2

et al. 2019

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We report an experimental study of the magnetic order and electronic structure and transport of the layered pnictide EuMnSb2, performed using neutron diffraction, angle-resolved photoemission spectroscopy (ARPES), and magnetotransport measurements. We find that the Eu and Mn sublattices display antiferromagnetic (AFM) order below T Eu N = 21(1) K and T Mn N = 350(2) K respectively. The former can be described by an A-type AFM structure with the Eu spins aligned along the c axis (an in-plane direction), whereas the latter has a C-type AFM structure with Mn moments along the a-axis (perpendicular to the layers). The ARPES spectra reveal Dirac-like linearly dispersing bands near the Fermi energy. Furthermore, our magnetotransport measurements show strongly anisotropic magnetoresistance, and indicate that the Eu sublattice is intimately coupled to conduction electron states near the Dirac point. 75.30.Gw, 74.70.Xa Topological semimetals can host quasiparticle excitations which masquerade as massless fermions due to the linearly-dispersing electronic bands created by interactions with the crystal lattice. The Dirac or Weyl nodes, where the conduction and valence bands meet in momentum space, are robust against small perturbations due to the protection afforded by crystalline symmetries or the topology of the electronic bands 1-5 . Topological semimetals exhibit exceptional electronic transport properties (e.g. extremely high carrier mobility and large linear magnetoresistance) and the control of these exotic charge carriers could help realize a new generation of spintronic devices with low power consumption 6-8 .Such control can potentially be realized in materials in which magnetic order coexists with non-trivial electronic band topology. Recent ARPES, quantum oscillation, neutron diffraction and ab initio band structure studies suggest that materials in the AMnSb 2 (A = Ca, Sr, Ba, Eu, Yb) family display many of the required properties 9-18 . The two-dimensional zig-zag layer of Sb atoms [ Fig. 1] in these 112-pnictides play host to fermions which can be described by the relativistic Dirac or Weyl equations. Furthermore, the electronic transport in this family of materials also displays large magnetoresistive effects, suggesting a coupling between the magnetism and charge carriers 9-17 . These effects could be driven by changes in the electronic band structure topology due to changes in the symmetry of the spin structures induced by the applied field 19 .Within the AMnSb 2 family, EuMnSb 2 is of particular interest because the conducting zig-zag layer of Sb atoms is sandwiched between two interpenetrating magnetic sublattices (Eu and Mn), as shown in Fig. 1(a). Such a structure may lead to an enhancement of the coupling between the topological quasiparticles and mag-netism, compared to that in compounds with a nonmagnetic atom on the A site. The dramatic magnetoresistive behaviour observed in a recent work 20 is evidence for the importance of this coupling. Up to now, however, the nature of the magnetic order in...

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Large negative magnetoresistance of a nearly Dirac material: Layered antimonide EuMnSb2

Cited by 67 publications

References 41 publications

Magnetic structures, spin-flop transition, and coupling of Eu and Mn magnetism in the Dirac semimetal EuMnBi2

Magnetic structures, spin-flop transition, and coupling of Eu and Mn magnetism in the Dirac semimetal EuMnBi2

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

Magnetic and electronic structure of Dirac semimetal candidate EuMnSb2

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