Magnetotransport signatures of chiral magnetic anomaly in the half-Heusler phase ScPtBi

Abstract

Study of magnetotransport properties of ScPtBi revealed simultaneously: a negative contribution to the longitudinal magnetoresistance, the planar Hall effect, and distinct angular narrowing of the longitudinal magnetoresistance { three hallmarks of chiral magnetic anomaly (pumping of axial charge between Weyl nodes), a distinct property of topological semimetals. Electronic structure calculations show that structural defects, such as antisites and vacancies, bring substantial density of states at the Fermi level of ScPtBi, indicating that it is a semimetal, not a zero-gap semiconductor, as predicted earlier. This is in accord with electrical resistivity in ScPtBi, showing no characteristics of semiconductor. Moreover, below 0.7K we observed an onset of a superconducting transition, with the resistivity disappearing completely below 0.23 K.

17 pages, 5 figures, +(Supplemental Material: 13 pages, 9 figures)

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• Weak antilocalization effect and triply degenerate state in Cu-doped CaAuAs
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• Insulating Half-Heusler TmPdSb with Unusual Band Order and Metallic Surface States
• Tuning of anomalous magnetotransport properties in half-Heusler topological semimetal GdPtBi
• Anomalous magnetotransport in the single-crystalline half-Heusler antiferromagnet ErPdSb
• Magnetic and electrical transport properties of the single-crystalline half-Heusler antiferromagnet DyNiSb