Fermi surface topology and negative longitudinal magnetoresistance observed in the semimetal NbAs2

We report transverse and longitudinal magnetotransport properties of NbAs2 single crystals. Attributing to the electron-hole compensation, nonsaturating large transverse magnetoresistance reaches up to 8000 at 9 T at 1.8 K with mobility around 1 to 2m2V-1S-1. We present a thorough study of angular-d...

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Bibliographic Details
Published in:Physical review. B 2016-05, Vol.93 (19)
Main Authors: Shen, Bing, Deng, Xiaoyu, Kotliar, Gabriel, Ni, Ni
Format: Article
Language:English
Subjects:
Condensed matter
Deltas
Magnetoresistance
Magnetoresistivity
Mathematical analysis
Oscillations
Pocket
Topology
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Summary:We report transverse and longitudinal magnetotransport properties of NbAs2 single crystals. Attributing to the electron-hole compensation, nonsaturating large transverse magnetoresistance reaches up to 8000 at 9 T at 1.8 K with mobility around 1 to 2m2V-1S-1. We present a thorough study of angular-dependent Shubnikov-de Haas (SdH) quantum oscillations of NbAs2. Three distinct oscillation frequencies are identified. First-principles calculations reveal four types of Fermi-surface pockets: electron [alpha] pocket, hole [beta] pocket, hole [gamma] pocket, and small electron [delta] pocket. Although the angular dependence of [alpha],[beta], and [delta] agree well with the SdH data, [gamma] pocket is missing in SdH. Negative longitudinal magnetoresistance is observed which may be linked to novel topological states in this material, although systematic study is necessary to ascertain its origin.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.93.195119