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Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal candidate NbP
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Journal Article
Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal candidate NbP
2015
Overview
Weyl semimetals are predicted to exhibit a host of unusual transport properties. NbP, a system predicted to share characteristics of both normal and Weyl semimetals, is now shown to have a very large, non-saturating magnetoresistance.
Recent experiments have revealed spectacular transport properties in semimetals, such as the large, non-saturating magnetoresistance exhibited by WTe
2
(ref.
1
). Topological semimetals with massless relativistic electrons have also been predicted
2
as three-dimensional analogues of graphene
3
. These systems are known as Weyl semimetals, and are predicted to have a range of exotic transport properties and surface states
4
,
5
,
6
,
7
, distinct from those of topological insulators
8
,
9
. Here we examine the magneto-transport properties of NbP, a material the band structure of which has been predicted to combine the hallmarks of a Weyl semimetal
10
,
11
with those of a normal semimetal. We observe an extremely large magnetoresistance of 850,000% at 1.85 K (250% at room temperature) in a magnetic field of up to 9 T, without any signs of saturation, and an ultrahigh carrier mobility of 5 × 10
6
cm
2
V
−1
s
−1
that accompanied by strong Shubnikov–de Haas (SdH) oscillations. NbP therefore presents a unique example of a material combining topological and conventional electronic phases, with intriguing physical properties resulting from their interplay.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
