Impurity Effects and Charge Transport in ABO₃ Single Crystal Oxides: Photorefractivity-Oriented and Basic Studies

Abstract

Non linear optical, dielectric, magnetic properties of ABO ₃ single crystal oxides let the implementation of acousto-optic, electro-optic, photonic, spintronic devices. In particular, significant role is played by the ferroelectric and photorefractive materials, where the photo-induced change in refractive indexes requires charge transport and impurities which support charge transfer, space charge formation and localization with accompanying electric field. Besides, ABO ₃ paraelectric perovskites regularly reveal newel effects connected with charge transport, e.g., photo-induced polar state recently reported for SrTiO ₃ and KTaO ₃ . In this work we review our recent investigation, pointing out our studies of photo-transport in SrTiO ₃ , Cu-doped KTaO ₃ and LiNbO3:Hf.

Keywords:

• Piezoelectric
• porous
• niobate
• dielectric constant
• porosity