Magnetotransport properties of ${\mathrm{MoP}}_2$

Journal Article · 02 November 2017 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.96.195107 · OSTI ID:1425073

Wang, Aifeng ^[1]; Graf, D. ^[2]; Stein, Aaron ^[1]; Liu, Yu ^[1]; Yin, Weigui ^[1]; Petrovic, Cedomir ^[1]

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1. Brookhaven National Lab. (BNL), Upton, NY (United States)
2. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)

We report magnetotransport and de Haas–van Alphen (dHvA) effect studies on MoP₂ single crystals, predicted to be a type- II Weyl semimetal with four pairs of robust Weyl points located below the Fermi level and long Fermi arcs. The temperature dependence of resistivity shows a peak before saturation, which does not move with magnetic field. Large nonsaturating magnetoresistance (MR) was observed, and the field dependence of MR exhibits a crossover from semiclassical weak-field B² dependence to the high-field linear-field dependence, indicating the presence of Dirac linear energy dispersion. In addition, a systematic violation of Kohler's rule was observed, consistent with multiband electronic transport. Strong spin-orbit coupling splitting has an effect on dHvA measurements whereas the angular-dependent dHvA orbit frequencies agree well with the calculated Fermi surface. The cyclotron effective mass ~1.6m_e indicates the bands might be trivial, possibly since the Weyl points are located below the Fermi level.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE
• Grant/Contract Number: SC0012704
• OSTI ID: 1425073
• Alternate ID(s): OSTI ID: 1406650
• Report Number(s): BNL-203216-2018-JAAM; PRBMDO; TRN: US1802031
• Journal Information: Physical Review B, Vol. 96, Issue 19; ISSN 2469-9950
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English