Shubnikov–de Haas oscillations inCoSb3single crystals

Abstract

Shubnikov--de Haas (SdH) effect has been studied in single-crystal samples of $p\ensuremath{-}{\mathrm{CoSb}}_{3}$ in pulsed magnetic fields up to 35 T. From the temperature dependence of the amplitude of the SdH oscillations the values of cyclotron effective mass were determined. It was found that the effective mass increases from ${0.07m}_{0}$ to ${0.15m}_{0}$ with increasing of the hole concentration, taking part in the SdH effect, from 0.46 to $4.06\ifmmode\times\else\texttimes\fi{}{10}^{18}{\mathrm{cm}}^{\ensuremath{-}3},$ indicating a nonparabolicity of the valence band of ${\mathrm{CoSb}}_{3}.$ The fundamental band parameters, the band-edge effective mass ${(m}_{n}^{*}{/m}_{0}=0.049\ifmmode\pm\else\textpm\fi{}0.006),$ energy gap ${(E}_{g}=31\ifmmode\pm\else\textpm\fi{}5\mathrm{meV}),$ spin-orbit splitting $(\ensuremath{\Delta}=0.16\ifmmode\pm\else\textpm\fi{}0.06\mathrm{eV}),$ and the interband momentum matrix element $[P=(2.0\ifmmode\pm\else\textpm\fi{}2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}\mathrm{eV}\mathrm{}\mathrm{cm}]$ were estimated using the three-band Kane model.