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arXiv · 1807.08006

Magnetotransport in Sr3PbO antiperovskite with three-dimensional massive Dirac electrons

S. Suetsugu·K. Hayama·A. W. Rost·J. Nuss·C. Mühle·J. Kim·K. Kitagawa·H. Takagi
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Abstract

Novel topological phenomena are anticipated for three-dimensional (3D) Dirac electrons. The magnetotransport properties of cubic ${\rm Sr_{3}PbO}$ antiperovskite, theoretically proposed to be a 3D massive Dirac electron system, are studied. The measurements of Shubnikov-de Haas oscillations and Hall resistivity indicate the presence of a low density ($\sim 1 \times 10^{18}$ ${\rm cm^{-3}}$) of holes with an extremely small cyclotron mass of 0.01-0.06$m_{e}$. The magnetoresistance $\Delta\rho_{xx}(B)$ is linear in magnetic field $B$ with the magnitude independent of temperature. These results are fully consistent with the presence of 3D massive Dirac electrons in ${\rm Sr_{3}PbO}$. The chemical flexibility of the antiperovskites and our findings in the family member, ${\rm Sr_{3}PbO}$, point to their potential as a model system in which to explore exotic topological phases.

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S. Suetsugu, K. Hayama, A. W. Rost, J. Nuss, C. Mühle, J. Kim, K. Kitagawa, H. Takagi. 2018-07-20. Magnetotransport in Sr3PbO antiperovskite with three-dimensional massive Dirac electrons. https://doi.org/10.1103/physrevb.98.115203

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