Anomalous Hall effect in Weyl semimetal half-Heusler compounds RPtBi (R = Gd and Nd)
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
Topological materials ranging from topological insulators to Weyl and Dirac semimetals form one of the most exciting current fields in condensed-matter research. Many half-Heusler compounds, RPtBi (R = rare earth), have been theoretically predicted to be topological semimetals. Among various topological attributes envisaged in RPtBi, topological surface states, chiral anomaly, and planar Hall effect have been observed experimentally. Here, we report an unusual intrinsic anomalous Hall effect (AHE) in the antiferromagnetic Heusler Weyl semimetal compounds GdPtBi and NdPtBi that is observed over a wide temperature range. In particular, GdPtBi exhibits an anomalous Hall conductivity of up to 60 Ω −1 ·cm −1 and an anomalous Hall angle as large as 23%. Muon spin-resonance (μSR) studies of GdPtBi indicate a sharp antiferromagnetic transition (T N ) at 9 K without any noticeable magnetic correlations above T N . Our studies indicate that Weyl points in these half-Heuslers are induced by a magnetic field via exchange splitting of the electronic bands at or near the Fermi energy, which is the source of the chiral anomaly and the AHE.
Details
Original language | English |
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Pages (from-to) | 9140-9144 |
Number of pages | 5 |
Journal | Proceedings of the National Academy of Sciences of the United States of America |
Volume | 115 |
Issue number | 37 |
Publication status | Published - 11 Sept 2018 |
Peer-reviewed | Yes |
External IDs
PubMed | 30154165 |
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Keywords
ASJC Scopus subject areas
Keywords
- Anomalous Hall conductivity, Berry curvature, Heuslers, Muon spin-resonance, Weyl semimetal