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.

Preprint, 16 pages, 6 main figures, 6 supplementary figures

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• 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