Electronic Structure of Kramers Nodal‐Line Semimetal YAuGe and Anomalous Hall Effect Induced by Magnetic Rare‐Earth Substitution

Electronic Structure of Kramers Nodal‐Line Semimetal YAuGe and Anomalous Hall Effect Induced by Magnetic Rare‐Earth Substitution

Abstract Nodal‐line semimetals are a class of topological materials hosting one dimensional lines of band degeneracy. Kramers nodal‐line (KNL) metals/semimetals have recently been theoretically recognized as a class of topological states inherent to all non‐centrosymmetric achiral crystal lattices....

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Main Authors: Takashi Kurumaji, Jorge I. Facio, Natsuki Mitsuishi, Shusaku Imajo, Masaki Gen, Motoi Kimata, Linda Ye, David Graf, Masato Sakano, Miho Kitamura, Kohei Yamagami, Kyoko Ishizaka, Koichi Kindo, Taka‐hisa Arima
Format: Article
Language:English
Published: Wiley 2025-07-01
Series:Advanced Science
Subjects:
anomalous hall effect
Kramers nodal‐line semimetal
quantum oscillations
Online Access:https://doi.org/10.1002/advs.202501669
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Summary:Abstract Nodal‐line semimetals are a class of topological materials hosting one dimensional lines of band degeneracy. Kramers nodal‐line (KNL) metals/semimetals have recently been theoretically recognized as a class of topological states inherent to all non‐centrosymmetric achiral crystal lattices. The electronic structure of candidate KNL semimetal YAuGe is investigated by angle‐resolved photoemission spectroscopy (ARPES) and quantum oscillations as well as by density functional theory (DFT) calculations. DFT has revealed that YAuGe hosts KNLs on the Γ‐A‐L‐M plane of the Brillouin zone, that are protected by the time reversal and mirror‐inversion symmetries. Through ARPES and quantum oscillations, signatures of hole bands enclosing the Γ point are identified, and the observed splitting of quantum oscillation frequency with angle is attributed to spin‐orbit‐coupling‐induced band splitting away from the KNLs. Furthermore, it is shown that the degeneracy of the nodal lines along the Γ‐A line is lifted by the time‐reversal‐symmetry breaking when the Y is substituted by magnetic R ions (R = rare earth). This becomes a source of Berry curvature and contributes to the anomalous Hall effect in magnetic RAuGe. These findings establish RAuGe as a new class of KNL semimetals offering significant potential for engineering of anomalous magnetotransport properties via magnetic rare‐earth substitution.
ISSN:2198-3844

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