Doping dependence and Fermi surface studies of the topological crystalline insulators Sn_xPb_1-xTe/Se

This work presents Fermi surface studies of the topological crystalline insulator Sn_xPb_1-xTe/Se. Magnetic torque measured at higher fields up to 35 T and temperatures down to 0.32 K shows clear de Haas-van Alphen (dHvA) oscillations. The dHvA oscillations are well-defined and consist of two major frequencies (F₁ ~ 46 T, F₂ ~ 230 T) for the x = 0.35 sample. To understand the Fermi surface properties, we have measured dHvA oscillations at different tilt angles with respect to the applied field and at different temperatures up to 60 K. The temperature dependent data was analyzed using the Lifshitz-Kosevich (LK) formula, and we estimated several parameters characterizing the Fermi surface.

 

Work at West Texas A&M University is supported by the Killgore Faculty Research program, the KRC Undergraduate Student Research Grant, and the Welch Foundation (Grant No. AE-0025); work at TcSUH was supported in part by the U.S. Air Force Office of Scientific Research Grant FA9550-15-1-0236, the T. L. L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at the University of Houston; work at the National High Magnetic Field Laboratory was supported by NSF/DMR-1644779 and the State of Florida.