Electronic Transport in Strontium Titanate

Abstract

The conductivity and the Hall and Seebeck coefficients of reduced and doped strontium titanate were measured over the temperature range 4.2-300\ifmmode^\circ\else\textdegree\fi{}K. An average effective mass of about 10 ${m}_{0}$ was deduced from these experiments. This value agrees well with the results of a recent energy-band calculation for SrTi${\mathrm{O}}_{3}$ based on a tight-binding approximation. Phonon-drag contributions to the Seebeck coefficient appear to be negligible above 50\ifmmode^\circ\else\textdegree\fi{}K. Such a result is expected in view of the very small heat conductivity reported by Sievers.