Extremely high magnetoresistance and conductivity in the type-II Weyl semimetals WP(2) and MoP(2).
Extremely high magnetoresistance and conductivity in the type-II Weyl semimetals WP(2) and MoP(2).
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DOI：
10.1038/s41467-017-01758-z
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发表时间：
2017-11-21
影响因子：
16.6
通讯作者：
Shekhar C
中科院分区：
文献类型：
--
作者：
Kumar N;Sun Y;Xu N;Manna K;Yao M;Süss V;Leermakers I;Young O;Förster T;Schmidt M;Borrmann H;Yan B;Zeitler U;Shi M;Felser C;Shekhar C
具有狄拉克和外尔交叉的半金属的特殊能带结构可以导致壮观的电子特性，例如伴随着极高的磁阻的大迁移率。特别是，两个紧密相邻的外尔点相同的手征被保护从湮灭的结构扭曲或缺陷，从而显着降低它们之间的散射概率。在这里，我们提出了过渡金属二磷化物，WP 2和MoP2，这是II型Weyl半金属与强大的Weyl点的电子性质的传输，角分辨光电子能谱和第一性原理计算。我们的WP2单晶在63 T和2.5 K下显示出极低的残余低温电阻率（3 nΩ cm），并伴有超过2亿%的巨大且高度各向异性的磁阻。我们观察到一个大的抑制电荷载流子的背散射在WP 2从运输测量。这些特性可能是该化合物中表达的新型Weyl费米子的结果。具有狄拉克和外尔交叉能带结构的半金属可以显示特殊的电子和磁性。在这里，作者探讨了II型外尔半金属，MoP2和WP2的电子特性与强大的外尔点，显示非常高的磁阻和导电性。
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, WP2 and MoP2, which are type-II Weyl semimetals with robust Weyl points by transport, angle resolved photoemission spectroscopy and first principles calculations. Our single crystals of WP2 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 WP2 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, MoP2 and WP2 with robust Weyl points which display very high magnetoresistance and conductivity.
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影响因子：
8.6
作者：
Du, X;Tsai, SW;Hebard, AF
通讯作者：
Hebard, AF
影响因子：
41.2
作者：
Liang, Tian;Gibson, Quinn;Ong, N. P.
通讯作者：
Ong, N. P.
DOI：
10.3891/acta.chem.scand.45-0781
发表时间：
1991-09-01
期刊：
ACTA CHEMICA SCANDINAVICA
影响因子：
--
作者：
MATHIS, H;GLAUM, R;GRUEHN, R
通讯作者：
GRUEHN, R
影响因子：
41.2
作者：
Hirschberger, Max;Kushwaha, Satya;Ong, N. P.
通讯作者：
Ong, N. P.
影响因子：
3.7
作者：
Kopelevich, Y;Pantoja, JCM;Moehlecke, S
通讯作者：
Moehlecke, S