Stripe Helical Magnetism and Two Regimes of Anomalous Hall Effect in NdAlGe

Abstract

We report the magnetic and electronic transport properties of the inversion and time-reversal symmetry breaking Weyl semimetal NdAlGe. This material is analogous to NdAlSi, whose helical magnetism presents a rare example of a Weyl-mediated collective phenomenon, but with a larger spin-orbit coupling. Our neutron diffraction experiments revealed that NdAlGe, similar to NdAlSi, supports an incommensurate Ising spin density wave ($T_{\text{inc}}=6.8$ K) with a small helical spin canting of 3${}^{\circ }$ and a long-wavelength of $\sim$ 35 nm, which transitions to a commensurate ferrimagnetic state below $T_{\text{com}}=5.1$ K. Using small-angle neutron scattering, we showed that the zero-field cooled ferrimagnetic domains form stripes in real space with characteristic length scales of 18 nm and 72 nm parallel and perpendicular to the [110] direction, respectively. Interestingly, for the transport properties, NdAlSi does not exhibit an anomalous Hall effect (AHE) that is commonly observed in magnetic Weyl semimetals. In contrast to NdAlSi, we identify two different AHE regimes in NdAlGe that are respectively governed by intrinsic Berry curvature and extrinsic disorders/spin fluctuations. Our study suggests that Weyl-mediated magnetism prevails in this group of noncentrosymmetric magnetic Weyl semimetals NdAl$X$, but transport properties including AHE are affected by material-specific extrinsic effects such as disorders, despite the presence of prominent Berry curvature.

arXiv commentPreprint, 16 pages, 6 main figures, 6 supplementary figures

References in corpus (40)

• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
• WannierTools: An open-source software package for novel topological materials
• Wannier90 as a community code: new features and applications
• Experimental discovery of Weyl semimetal TaAs
• Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• First Principles Calculation of Anomalous Hall Conductivity in Ferromagnetic bcc Fe
• Large intrinsic anomalous Hall effect in half-metallic ferromagnet Co3Sn2S2 with magnetic Weyl fermions
• Universal Scaling Behavior of Anomalous Hall Effect and Anomalous Nernst Effect in Itinerant Ferromagnets
• Berry Phase Theory of Anomalous Hall Effect: Application to Colossal Magnetoresistance Manganites
• Proper Scaling of the Anomalous Hall Effect
• Intrinsic vs. extrinsic anomalous Hall effect in ferromagnets
• Anomalous Hall Effect in Weyl Metals
• Linear magnetization dependence of the intrinsic anomalous Hall effect
• Chirality driven anomalous Hall effect in weak coupling regime
• Theoretical prediction of magnetic and noncentrosymmetric Weyl fermion semimetal states in the R-Al-X family of compounds (R=rare earth, Al=aluminium, X=Si, Ge)
• Topological Magnetic Phase in the Candidate Weyl Semimetal CeAlGe
• Temperature Dependence of the Intrinsic Anomalous Hall Effect in Nickel
• RKKY interaction of magnetic impurities in Dirac and Weyl semimetals
• The anomalous Hall Effect and magnetoresistance in the layered ferromagnet Fe_{1/4}TaS_2: the inelastic regime
• Magnetism and anomalous transport in the Weyl semimetal PrAlGe: Possible route to axial gauge fields
• A new noncollinear ferromagnetic Weyl semimetal with anisotropic anomalous Hall effect
• Observation of Weyl fermions in a magnetic non-centrosymmetric crystal
• Single crystal investigation of proposed type-II Weyl semimetal CeAlGe
• Ruderman-Kittel-Kasuya-Yosida interaction in Weyl semimetals
• Transition from Intrinsic to Extrinsic Anomalous Hall Effect in the Ferromagnetic Weyl Semimetal PrAlGe${}_{1-x}$Si${}_x$
• RKKY interaction in three-dimensional electron gases with linear spin-orbit coupling
• Topological spiral magnetism in the Weyl semimetal SmAlSi
• Bulk single crystal growth of the theoretically predicted magnetic Weyl semimetals $R$AlGe ($R$ = Pr, Ce)
• Anomalous Hall effect and negative longitudinal magnetoresistance in half-Heusler topological semimetal candidates TbPtBi and HoPtBi
• Mapping Domain Wall Topology in the Magnetic Weyl Semimetal CeAlSi
• Topological features in the ferromagnetic Weyl semimetal CeAlSi: Role of domain walls
• Tuning the nontrivial topological properties of the Weyl semimetal CeAlSi
• The dynamics of local magnetic moments induced by itinerant Weyl electrons
• Robust tunability of magnetorestance in Half-Heusler RPtBi (R = Gd, Dy, Tm, and Lu) compounds
• Quantum field theory of topological spin dynamics
• Pressure tuning domain-wall chirality in noncentrosymmetric magnetic Weyl semimetal CeAlGe

Cited by in corpus (15)

• Multi-k magnetic structure and large anomalous Hall effect in candidate magnetic Weyl semimetal NdAlGe
• Topological Hall effect in CeAlGe
• Magnetic, thermodynamic, and magnetotransport properties of CeGaGe and PrGaGe single crystals
• Anomalous Hall effect with plateaus observed in a magnetic Weyl semimetal NdAlGe at low temperatures
• Abnormally enhanced Hall Lorenz number in the magnetic Weyl semimetal NdAlSi
• Weyl-mediated Ruderman-Kittel-Kasuya-Yosida interaction revisited: imaginary-time formalism and finite temperature effects
• Non-Hermitian Boundary in a Surface Selective Reconstructed Magnetic Weyl Semimetal
• Spin order and dynamics in the topological rare-earth germanide semimetals
• Anisotropic metamagnetism and magnetotransport of heavy rare-earth orthorhombic single-crystal TbAlGe
• Significant Chiral Magnetotransport Magnified by Multiple Weyl Nodes
• Single crystalline orthorhombic GdAlGe as a rare earth magnetic Dirac nodal-line metal
• Structural characterization of the candidate Weyl semimetal CeGaGe
• Correlated helimagnetic configuration in a nonsymmorphic magnetic nodal semimetal
• Incommensurate magnetic order drives singular angular magnetoresistance in a Weyl semimetal
• Accessing quasi-flat $\text{f}$-bands to harvest large Berry curvature in NdGaSi