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Published 2006 | public
Journal Article

Structural Phase Transition and Photo-Charge Carrier Transport in SrTiO_3

Abstract

The effect of the antiferrodistorsive phase transition observed at ~ 105 K on the photo-carriers transport and band structure of nominally pure SrTiO_3 single crystals was investigated. Simultaneously the ab-initio analysis based on the DFT-HF hybrid approach was performed in order to elucidate the atomic and electronic structure changes. It was found that the structural transition play a minor role in photo-charge transport. However, in highly resistive specimens at low UV-light intensities or under visible-light, 514 nm excitation, weak photoconductivity features are observed in the transition region. Besides, in this region the temperature maximum was found for the photoconductivity spectra. Experimental results are discussed and agree well with theoretical predictions.

Additional Information

© 2006 Taylor and Francis. Paper originally presented at IMF-II, Iguassu Falls, Brazil, September 5-9, 2005; received for publication January 26, 2006. This work was supported by Project 1QS100100563 of the AS CR, the Program of the Presidium RAS "Low dimensional quantum structures" and by Italian Grant FIRB RBNE01KZ94.

Additional details

Created:
August 22, 2023
Modified:
October 23, 2023