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Extremely high magnetoresistance and conductivity in the type-II Weyl semimetals WP2 and MoP2
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Extremely high magnetoresistance and conductivity in the type-II Weyl semimetals WP2 and MoP2
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Journal Article
Extremely high magnetoresistance and conductivity in the type-II Weyl semimetals WP2 and MoP2
2017
Overview
The peculiar band structure of semimetals exhibiting Dirac and Weyl crossings can lead to spectacular electronic properties such as large mobilities accompanied by extremely high magnetoresistance. In particular, two closely neighboring Weyl points of the same chirality are protected from annihilation by structural distortions or defects, thereby significantly reducing the scattering probability between them. Here we present the electronic properties of the transition metal diphosphides, WP
2
and MoP
2
, which are type-II Weyl semimetals with robust Weyl points by transport, angle resolved photoemission spectroscopy and first principles calculations. Our single crystals of WP
2
display an extremely low residual low-temperature resistivity of 3 nΩ cm accompanied by an enormous and highly anisotropic magnetoresistance above 200 million % at 63 T and 2.5 K. We observe a large suppression of charge carrier backscattering in WP
2
from transport measurements. These properties are likely a consequence of the novel Weyl fermions expressed in this compound.
Semimetals with the band structure exhibiting Dirac and Weyl crossings can show special electronic and magnetic properties. Here the authors explore the electronic properties of the type-II Weyl semimetals, MoP
2
and WP
2
with robust Weyl points which display very high magnetoresistance and conductivity.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
