Chin. Phys. Lett.  2018, Vol. 35 Issue (11): 117101    DOI: 10.1088/0256-307X/35/11/117101
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Magnetotransport Properties of a Nodal Line Semimetal TiSi
Moran Gao1,2, Junbao He3, Wenliang Zhu1,2, Shuai Zhang1, Xinmin Wang1,2, Jing Li1,2, Chaoyang Ma1, Hui Liang1,2, Zhian Ren1,4, Genfu Chen1,2,4**
1Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049
3College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061
4Collaborative Innovation Center of Quantum Matter, Beijing 100190
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Moran Gao, Junbao He, Wenliang Zhu et al  2018 Chin. Phys. Lett. 35 117101
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Abstract We report the magnetoresistance (MR), de Haas-van Alphen (dHvA) effect and Hall effect measurements on a single crystal of TiSi, which is predicted to be a nodal line semimetal. With application of a magnetic field, a metal-to-insulator-like transition in $\rho(T)$ and a nonsaturating MR are observed at low temperatures. The dHvA oscillations reveal a small Fermi-surface pocket with a nontrivial Berry phase. The analysis of the nonlinear Hall resistivity shows that TiSi is a multiband system with low carrier densities and high mobilities. All these results unambiguously prove the existence of Dirac fermions in TiSi.
Received: 26 September 2018      Published: 23 October 2018
PACS:  71.55.Ak (Metals, semimetals, and alloys)  
  71.30.+h (Metal-insulator transitions and other electronic transitions)  
  75.47.-m (Magnetotransport phenomena; materials for magnetotransport)  
  81.10.Fq (Growth from melts; zone melting and refining)  
Fund: Supported by the National Key Research Program of China under Grant Nos 2016YFA0401000 and 2016YFA0300604, the National Basic Research Program of China under Grant No 2015CB921303, the Strategic Priority Research Program (B) of Chinese Academy of Sciences under Grant No XDB07020100, and the National Natural Science Foundation of China under Grant No 11874417.
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https://cpl.iphy.ac.cn/10.1088/0256-307X/35/11/117101       OR      https://cpl.iphy.ac.cn/Y2018/V35/I11/117101
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Moran Gao
Junbao He
Wenliang Zhu
Shuai Zhang
Xinmin Wang
Jing Li
Chaoyang Ma
Hui Liang
Zhian Ren
Genfu Chen
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