Emergence of Weyl fermions by ferrimagnetism in a noncentrosymmetric magnetic Weyl semimetal

Li, Cong; Zhang, Jianfeng; Wang, Yang; Liu, Hongxiong; Guo, Qinda; Rienks, Emile; Chen, Wanyu; Bertran, Francois; Yang, Huancheng; Phuyal, Dibya; Fedderwitz, Hanna; Thiagarajan, Balasubramanian; Dendzik, Maciej; Berntsen, Magnus H.; Shi, Youguo; Xiang, Tao; Tjernberg, Oscar

doi:10.1038/s41467-023-42996-8

Cited by 6 publications

(1 citation statement)

References 82 publications

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“…109) is a new class of magnetic Weyl semimetals where both the inversion and time-reversal symmetries are broken [16,17]. Recent studies have suggested a topological magnetic order in SmAlSi [18] and NdAlSi [19,20], topological Hall effect in SmAlSi [18] and CeAl(Si,Ge) [18,21,22], anomalous Hall and Nernst effects * kikugawa.naoki@nims.go.jp in PrAl(Ge,Si) and NdAl(Si,Ge) [23][24][25], anomalous thermal conductivity [26], unusual quantum oscillations in NdAlSi [27,28], possible axial gauge fields in PrAlGe [25], domain wall chirality in CeAl(Si,Ge) [22,29], surface Fermi arcs and bulk Weyl fermion dispersion in PrAlGe [30] and NdAlSi [31], and reconstruction of the electronic structure across the magnetic transition in PrAlGe [32].…”

Section: Introductionmentioning

confidence: 99%

Anomalous Hall effect in the magnetic Weyl semimetal NdAlGe with plateaus observed at low temperatures

Kikugawa,

Uji,

Terashima

2024

Phys. Rev. B

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In the RAl(Si,Ge) (R: lanthanides) family, both spatial inversion and time-reversal symmetries are broken. This may offer opportunities to study Weyl-fermion physics in nontrivial spin structures emerging from a noncentrosymmetric crystal structure. In this study, we investigated the anomalous Hall effect (AHE) in NdAlGe via magnetotransport, magnetization, and magnetic torque measurements down to 40 mK (0.4 K for magnetization). The single crystals grown by a laser-heated floating-zone method exhibit a single magnetic phase transition at T M = 13.5 K, where the T M is the transition temperature. With the magnetic field parallel to the easy [001] axis, the AHE gradually evolves as the temperature decreases below T M . The anomalous Hall conductivity (AHC) reaches ∼320 −1 cm −1 at 40 mK in the magnetically saturated state. Except in low-temperature low-field plateau phases, the AHC and magnetization are proportional, and their ratio agrees with the ratios for conventional ferromagnets, suggesting that the intrinsic AHE occurs by the Karplus-Luttinger mechanism. Below ∼0.6 K, the curves of Hall resistivity against the field exhibit plateaus at low fields below ∼0.5 T, correlating with the plateaus in the magnetization curve. For the first plateau, the magnetization is one order of magnitude smaller than the magnetically saturated state, whereas the AHE is more than half that in the saturated state. This finding under well below T M suggests that the AHE at the first plateau is not governed by the magnetization and may be interpreted based on a multipole or spin chirality.

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Section: Introductionmentioning

confidence: 99%

Anomalous Hall effect in the magnetic Weyl semimetal NdAlGe with plateaus observed at low temperatures

Kikugawa,

Uji,

Terashima

2024

Phys. Rev. B

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Spin order and dynamics in the topological rare-earth germanide semimetals

Wang,

Zhen,

Meng

et al. 2024

Sci. China Phys. Mech. Astron.

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The REAl(Si,Ge) (RE = rare earth) family, known to break both the inversion- and time-reversal symmetries, represents one of the most suitable platforms for investigating the interplay between correlated-electron phenomena and topologically nontrivial bands. Here, we report on systematic magnetic, transport, and muon-spin rotation and relaxation (uSR) measurements on (Nd,Sm)AlGe single crystals, which exhibit antiferromagnetic (AFM) transitions at TN = 6.1 and 5.9 K, respectively. In addition, NdAlGe undergoes also an incommensurate-to-commensurate ferrimagnetic transition at 4.5 K. Weak transverse-field µSR measurements confirm the AFM transitions, featuring a ∼90% magnetic volume fraction. Zero-field (ZF) µSR measurements reveal a more disordered internal field distribution in NdAlGe than in SmAlGe, reflected in a larger transverse muon-spin relaxation rate λT at T ≪ TN. This may be due to the complex magnetic structure of NdAlGe, which undergoes a series of metamagnetic transitions in an external magnetic field, while SmAlGe shows only a robust AFM order. In NdAlGe, the topological Hall effect (THE) appears between the first and the second metamagnetic transitions for H ∥ c, while it is absent in SmAlGe. Such THE in NdAlGe is most likely attributed to the field-induced topological spin textures. The longitudinal muon-spin relaxation rate λL, diverges near the AFM order, followed by a clear drop at T < TN. In the magnetically ordered state, spin fluctuations are significantly stronger in NdAlGe than in SmAlGe. In general, our longitudinal-field μSR data indicate vigorous spin fluctuations in NdAlGe, thus providing valuable insights into the origin of THE and of the possible topological spin textures in REAl(Si,Ge) Weyl semimetals.

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Enhanced transport anisotropy of Bi film through carrier mobility modulation controlled by calcium metal

Zhang,

Wang,

Zhang

2024

Journal of Alloys and Compounds

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Emergence of Weyl fermions by ferrimagnetism in a noncentrosymmetric magnetic Weyl semimetal

Cited by 6 publications

References 82 publications

Anomalous Hall effect in the magnetic Weyl semimetal NdAlGe with plateaus observed at low temperatures

Anomalous Hall effect in the magnetic Weyl semimetal NdAlGe with plateaus observed at low temperatures

Spin order and dynamics in the topological rare-earth germanide semimetals

Enhanced transport anisotropy of Bi film through carrier mobility modulation controlled by calcium metal

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