Planar Hall effect in the Weyl semimetal GdPtBi

The recent discovery of Weyl and Dirac semimetals is one of the most important progresses in condensed matter physics. Among the very few available tools to characterize Weyl semimetals through electrical transport, negative magnetoresistance is most commonly used. Considering the shortcomings of th...

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Bibliographic Details
Published in:Physical review. B 2018-07, Vol.98 (4), p.041103(R), Article 041103
Main Authors: Kumar, Nitesh, Guin, Satya N., Felser, Claudia, Shekhar, Chandra
Format: Article
Language:English
Subjects:
Condensed matter physics
Curvature
Electromagnetism
Hall effect
Magnetoresistance
Magnetoresistivity
Metalloids
Transport
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Summary:The recent discovery of Weyl and Dirac semimetals is one of the most important progresses in condensed matter physics. Among the very few available tools to characterize Weyl semimetals through electrical transport, negative magnetoresistance is most commonly used. Considering the shortcomings of this method, new tools to characterize the chiral anomaly in Weyl semimetals are desirable. We employ the planar Hall effect (PHE) as an effective technique in the half Heusler Weyl semimetal GdPtBi to study the chiral anomaly. This compound exhibits a large value of 1.5 mΩcm planar Hall resistivity at 2 K and in 9 T. Our analysis reveals that the observed amplitude is dominated by Berry curvature and chiral anomaly contributions. Through angle-dependent transport studies we establish that GdPtBi with relatively small orbital magnetoresistance is an ideal candidate to observe the large PHE.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.041103