Large unsaturated positive and negative magnetoresistance in Weyl semimetal TaP

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• 作者：JianHua Du ; HangDong Wang ; Qin Chen…
• 关键词：Weyl semimetal ; positive and negative magnetoresistance ; Weyl fermions
• 刊名：SCIENCE CHINA Physics, Mechanics & Astronomy
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：59
• 期：5
• 全文大小：1,196 KB
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• 作者单位：JianHua Du (1)
  HangDong Wang (2)
  Qin Chen (1)
  QianHui Mao (1)
  Rajwali Khan (1)
  BinJie Xu (1)
  YuXing Zhou (1)
  YanNan Zhang (1)
  JinHu Yang (2)
  Bin Chen (2)
  ChunMu Feng (1)
  MingHu Fang (1) (3)
  
  1. Department of Physics, Zhejiang University, Hangzhou, 310027, China
  2. Department of Physics, Hangzhou Normal University, Hangzhou, 310036, China
  3. Collaborative Innovation Center of Advanced Microstructures, Nanjing, 210093, China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Chinese Library of Science
  Mechanics, Fluids and Thermodynamics
  Physics
  
• 出版者：Science China Press, co-published with Springer
• ISSN：1869-1927

文摘

After successfully growing single-crystal TaP, we measured its longitudinal resistivity (ρ _xx ) and Hall resistivity (ρ _yx ) at magnetic fields up to 9 T in the temperature range of 2-300 K. At 8 T, the magnetoresistance (MR) reached 3.28 × 105% at 2 K, 176% at 300 K. Neither value appeared saturated. We confirmed that TaP is a hole-electron compensated semimetal with a low carrier concentration and high hole mobility of μ _h=3.71 × 105 cm2/V s, and found that a magnetic-field-induced metal-insulator transition occurs at room temperature. Remarkably, because a magnetic field (H) was applied in parallel to the electric field (E), a negative MR due to a chiral anomaly was observed and reached -3000% at 9 T without any sign of saturation, either, which is in contrast to other Weyl semimetals (WSMs). The analysis of the Shubnikov-de Haas (SdH) oscillations superimposed on the MR revealed that a nontrivial Berry’s phase with a strong offset of 0.3958, which is the characteristic feature of charge carriers enclosing a Weyl node. These results indicate that TaP is a promising candidate not only for revealing fundamental physics of the WSM state but also for some novel applications.