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

Shekhar C, Kumar N, Grinenko V, Singh S, Sarkar R, Luetkens H, Wu SC, Zhang Y, Komarek AC, Kampert E, Skourski Y, Wosnitza J, Schnelle W, Mccollam A, Zeitler U, Kuebler J, Yan B, Klauss HH, Parkin SSP, Felser C (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Proceedings of the National Academy of Sciences of the United States of America National Academy of Sciences

Book Volume: 115

Pages Range: 9140-9144

Journal Issue: 37

DOI: 10.1073/pnas.1810842115

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.

Involved external institutions

Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Technische Universität Dresden DE Germany (DE) Paul Scherrer Institute (PSI) CH Switzerland (CH) Helmholtz-Zentrum Dresden-Rossendorf (HZDR) DE Germany (DE) Radboud University Nijmegen NL Netherlands (NL) Max-Planck-Institut für Mikrostrukturphysik (MSP) / Max Planck Institute for Microstructure Physics DE Germany (DE) Technische Universität Darmstadt DE Germany (DE)

How to cite

APA:

Shekhar, C., Kumar, N., Grinenko, V., Singh, S., Sarkar, R., Luetkens, H.,... Felser, C. (2018). 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, 115(37), 9140-9144. https://doi.org/10.1073/pnas.1810842115

MLA:

Shekhar, Chandra, et al. "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 115.37 (2018): 9140-9144.

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