Abstract
We have found that Raman spectra of semiconducting SrTiO3 exhibit, in addition to phonon spectra of pure SrTiO3, a low frequency band below 50 cm-1 and two higher frequency ones around 150 cm-1 below temperature at ca 70 K, which are identified as due to the electronic interband transitions among the lowest, second-higher, and spin-orbit split-off conduction bands at the zone center. The Raman shift of the higher bands nearly coincides with the value estimated from the spin-orbit interaction of Ti-3d electron. The experimantal spectra are reproduced by using the joint density of states based on the band parameters which are obtained in the recent Shubnikov de Haas experiment and also taking into account effect of life time broadening. The final state of higher energy is found to have the shorter life time in the Raman process.
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