Anomalous Hall effect in Weyl semimetal half-Heusler compounds RPtBi (R = Gd and Nd)

Proceedings of the National Academy of Sciences of the United States of America
Chandra ShekharClaudia Felser

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 (TN) at 9 K without any noticeable magnetic correlations above TN 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.

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Citations

Nov 9, 2019·Science Advances·Abhay Kumar NayakHaim Beidenkopf
Jun 7, 2019·Nature Communications·Nitesh KumarChandra Shekhar
Feb 11, 2020·Advanced Materials·Nitesh KumarClaudia Felser
Jun 2, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·V Nagpal, S Patnaik
Aug 23, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·S Shanmukharao SamathamK G Suresh
Jun 5, 2020·Science Advances·Liangcai XuKamran Behnia
Nov 4, 2020·Nature Materials·Prineha NarangClaudia Felser
Mar 31, 2021·Physical Review Letters·Wei JiangTony Low
May 5, 2021·Nature Communications·Dongxue DuJason K Kawasaki
Jun 10, 2021·Scientific Reports·Anupam BhattacharyaRatnamala Chatterjee
Mar 3, 2020·Chemistry of Materials : a Publication of the American Chemical Society·Gohil S ThakurClaudia Felser
Jul 29, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·A MukhopadhyayN Mohapatra

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