Origin of extremely large magnetoresistance in the candidate type-II Weyl semimetal MoTe 2− x

Sangyun Lee, Jaekyung Jang, Sung Il Kim, Soon Gil Jung, Jihyun Kim, Suyeon Cho, Sung Wng Kim, Joo Yull Rhee, Kee Su Park, Tuson Park

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The recent observation of extremely large magnetoresistance (MR) in the transition-metal dichalcogenide MoTe2 has attracted considerable interest due to its potential technological applications as well as its relationship with novel electronic states predicted for a candidate type-II Weyl semimetal. In order to understand the origin of the MR, the electronic structure of MoTe2−x (x = 0.08) is systematically tuned by application of pressure and probed via its Hall and longitudinal conductivities. With increasing pressure, a monoclinic-to-orthorhombic (1 T′ to Td) structural phase transition temperature (T*) gradually decreases from 210 K at 1 bar to 58 K at 1.1 GPa, and there is no anomaly associated with the phase transition at 1.4 GPa, indicating that a T = 0 K quantum phase transition occurs at a critical pressure (Pc) between 1.1 and 1.4 GPa. The large MR observed at 1 bar is suppressed with increasing pressure and is almost saturated at 100% for P > Pc. The dependence on magnetic field of the Hall and longitudinal conductivities of MoTe2−x shows that a pair of electron and hole bands are important in the low-pressure Td phase, while another pair of electron and hole bands are additionally required in the high-pressure 1 T′ phase. The MR peaks at a characteristic hole-to-electron concentration ratio (nc) and is sharply suppressed when the ratio deviates from nc within the Td phase. These results establish the comprehensive temperature-pressure phase diagram of MoTe2−x and underscore that its MR originates from balanced electron-hole carrier concentrations.

Original languageEnglish
Article number13937
JournalScientific Reports
Issue number1
StatePublished - 1 Dec 2018

Bibliographical note

Funding Information:
We acknowledge a fruitful discussion with Yongkang Luo, Sangmo Cheon, Youngkuk Kim, and J. D. Thompson. Work at Sungkyunkwan University was supported by a NRF grant funded by the Ministry of Science, ICT and Future Planning (No. 2012R1A3A2048816). J. Y. R and J. J acknowledge support from NRF-2014R1A1A2058975 and NRF-2016R1A6A3A11933107. S.-G. Jung was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2015R1D1A1A01060382).

Publisher Copyright:
© 2018, The Author(s).


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