Resonant x-ray scattering study of diffuse magnetic scattering from the topological semimetals 
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Soh, Jian-Rui; Schierle, E.; Yan, Dayu; Su, Hao; Prabhakaran, D.; Weschke, E.; Guo, Yanfeng; Shi, Youguo; Boothroyd, A. T.

doi:10.1103/physrevb.102.014408

Cited by 25 publications

(9 citation statements)

References 49 publications

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“…We show one magnetic unit cell in Figure 2a where the order is FM within the Eu layers but with alternating direction (AFM) between the layers. This A‐type AFM order has been previously reported in crystals of EuCd 2 As 2 and EuCd 2 Sb 2 , [ 23–27 ] and is consistent with the magnetic susceptibility data in Figure 2b that shows a FM order when H ∥ ab , but an AFM order when H ∥ c . The finite residual χ c ( T ) near zero temperature indicates a small out‐of‐plane spin canting superposed on the A‐type AFM order.…”

Section: Figuresupporting

confidence: 91%

Colossal Magnetoresistance without Mixed Valence in a Layered Phosphide Crystal

et al. 2021

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Materials with strong magnetoresistive responses are the backbone of spintronic technology, magnetic sensors, and hard drives. Among them, manganese oxides with a mixed valence and a cubic perovskite structure stand out due to their colossal magnetoresistance (CMR). A double exchange interaction underlies the CMR in manganates, whereby charge transport is enhanced when the spins on neighboring Mn3+ and Mn4+ ions are parallel. Prior efforts to find different materials or mechanisms for CMR resulted in a much smaller effect. Here an enormous CMR at low temperatures in EuCd2P2 without manganese, oxygen, mixed valence, or cubic perovskite structure is shown. EuCd2P2 has a layered trigonal lattice and exhibits antiferromagnetic ordering at 11 K. The magnitude of CMR (104%) in as‐grown crystals of EuCd2P2 rivals the magnitude in optimized thin films of manganates. The magnetization, transport, and synchrotron X‐ray data suggest that strong magnetic fluctuations are responsible for this phenomenon. The realization of CMR at low temperatures without heterovalency leads to a new regime for materials and technologies related to antiferromagnetic spintronics.

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Section: Figuresupporting

confidence: 91%

Colossal Magnetoresistance without Mixed Valence in a Layered Phosphide Crystal

et al. 2021

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“…[ 16 ] The FM correlations in EuCd 2 As 2 have been observed directly by resonant X‐ray magnetic scattering. [ 17 ] Interestingly, only a single pair of Weyl nodes is found in the condition of field‐induced full spin alignment along the c axis. [ 18 ] Thus, such a system provides a rare case for studying the transition between the Dirac and Weyl states by tuning temperature or field.…”

Section: Introductionmentioning

confidence: 99%

Unusual Electrical and Magnetic Properties in Layered EuZn₂As₂

et al. 2022

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Eu-based compounds often exhibit unusual magnetism, which is critical for nontrivial topological properties seen in materials such as EuCd 2 As 2 . The authors investigate the structure and physical properties of EuZn 2 As 2 through measurements of the electrical resistivity, Hall effect, magnetization, and neutron diffraction. Their data show that EuZn 2 As 2 orders antiferromagnetically with an A-type spin configuration below T N = 19 K. Surprisingly, there is strong evidence for dominant ferromagnetic fluctuations above T N , as reflected by positive Curie-Weiss temperature and extremely large negative magnetoresistance (MR) between T N and T fl ≈200 K. Furthermore, the angle dependence of the MR ab indicates field-induced spin reorientation from the ab-plane to a direction ≈45°from the ab plane. Compared to EuCd 2 As 2 , the doubled T N and T fl make EuZn 2 As 2 a better platform for exploring nontrivial magnetic and electronic properties in both magnetic fluctuation (T N < T < T fl ) and ordered (T < T N ) regimes.

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“…Recent observations of anisotropic magnetoresistance, spin-fluctuation-induced Dirac nodes, and non-linear anomalous Hall effect in EuCd 2 As 2 have made this material an interesting candidate to study the interplay between topology and magnetism [1][2][3][4][5][6][7][8] . EuCd 2 As 2 undergoes an A-type antiferromagnetic (AFM) order at 9.2 K with considerable anisotropy between the in-plane and out-ofplane magnetic susceptibilities 7 .…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of the magnetic and transport properties in EuZn$_2$As$_2$

Wang,

Been,

Gaudet

et al. 2022

Preprint

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Several recent studies have shown that the anisotropy in the magnetic structure of EuCd2As2 plays a significant role in stabilizing the Weyl nodes. To investigate the relationship between magnetic anisotropy and Weyl physics, we present a comparative study between EuZn2As2 and EuCd2As2 that are isostructural but with different magnetic anisotropy. We performed structural analysis, electronic transport, and magnetization experiments on millimeter-sized single crystals of EuZn2As2, and compared the results to those of EuCd2As2. By combining the first principle calculations and neutron diffraction experiment, we identify the magnetic ground state of EuZn2As2 as A-type antiferromagnetic order with a transition temperature (TN = 19.6 K) twice that of EuCd2As2. Like EuCd2As2, the negative magnetoresistance of EuZn2As2 is observed after suppressing the resistivity peak at TN with increasing fields. However, the anisotropy in both transport and magnetization are much reduced in EuZn2As2. The difference could be ascribed to the weaker spin-orbit coupling, more localized d-orbitals, and a larger contribution from the Eu s-orbitals in the zinc compound, as suggested by the electronic band calculations. The same band structure effect could be also responsible for the observation of a smaller non-linear anomalous Hall effect in EuZn2As2 compared to EuCd2As2.

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Resonant x-ray scattering study of diffuse magnetic scattering from the topological semimetals EuCd2As2 and EuCd2Sb2

Cited by 25 publications

References 49 publications

Colossal Magnetoresistance without Mixed Valence in a Layered Phosphide Crystal

Colossal Magnetoresistance without Mixed Valence in a Layered Phosphide Crystal

Unusual Electrical and Magnetic Properties in Layered EuZn₂As₂

Anisotropy of the magnetic and transport properties in EuZn$_2$As$_2$

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Resonant x-ray scattering study of diffuse magnetic scattering from the topological semimetals EuCd2As2 and EuCd2Sb2

Cited by 25 publications

References 49 publications

Colossal Magnetoresistance without Mixed Valence in a Layered Phosphide Crystal

Colossal Magnetoresistance without Mixed Valence in a Layered Phosphide Crystal

Unusual Electrical and Magnetic Properties in Layered EuZn2As2

Anisotropy of the magnetic and transport properties in EuZn$_2$As$_2$

Contact Info

Product

Resources

About

Unusual Electrical and Magnetic Properties in Layered EuZn₂As₂