Conduction Band Structure of SrTiO₃

Shubnikov de Haas(SdH) oscillations have been measured for the semiconducting single domain SrTiO 3 with Carrier concentration of 3.4×10 18 cm -3 and 5.9×10 18 cm -3 . From the temperature dependence of the SdH amplitude, the cyclotron mass values are determined for the [001] and [110] magnetic field directions. We have found, from the angular dependence of the SdH oscillation, that there exist several branches of the frequencies among which the highest and lowest branches originate from the Fermi spheres at the Brillouin zone center, and the other ones from the extremal area which is interconnected through the magnetic breakdown tunneling paths. Energy band parameters based on the k p perturbation method are determined.