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나노 구조 물리 연구단
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Origin of extremely large magnetoresistance in the candidate type-II Weyl semimetal MoTe2-x

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Title
Origin of extremely large magnetoresistance in the candidate type-II Weyl semimetal MoTe2-x
Author(s)
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
Publication Date
2018-09
Journal
SCIENTIFIC REPORTS, v.8, no., pp.13937 -
Publisher
NATURE PUBLISHING GROUP
Abstract
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 (1T' to T-d) 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 (P-c) 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 > P-c. 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 T-d phase, while another pair of electron and hole bands are additionally required in the high-pressure 1T' phase. The MR peaks at a characteristic hole-to-electron concentration ratio (n(c)) and is sharply suppressed when the ratio deviates from n(c) within the T-d 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. © The Author(s) 2018
URI
https://pr.ibs.re.kr/handle/8788114/5200
ISSN
2045-2322
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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