Mesoscopic fluctuating domains in strontium titanate

Persistent photoconductivity in strontium titanate.

Persistent photoconductivity was observed in strontium titanate (SrTiO(3)) single crystals. When exposed to sub-bandgap light (2.9 eV or higher) at room temperature, the free-electron concentration increases by over 2 orders of magnitude. After the light is turned off, the enhanced conductivity persists for several days, with negligible decay. From positron lifetime measurements, the persistent...

Phase Transitions in Strontium Titanate

Strontium Titanate SrTiO3 (STO) is known to undergo an antiferrodistortive transition from cubic to tetragonal phase at Tc ≈ 105K, and classical to quantum paraelectric phase transition at Tq ≈ 37K. This paper is intended to use Landau Theory to explore these two phase transitions of STO, as well as some experimental techniques to examine this model.

Multiferroic domain dynamics in strained strontium titanate.

Multiferroicity can be induced in strontium titanate by applying biaxial strain. Using optical second harmonic generation, we report a transition from 4/mmm to the ferroelectric mm2 phase, followed by a transition to a ferroelastic-ferroelectric mm2 phase in a strontium titanate thin film. Piezoelectric force microscopy is used to study ferroelectric domain switching. Second harmonic generation...

Wulff shape of strontium titanate nanocuboids

Infrared absorption of hydrogen-related defects in strontium titanate

Hydrogen has a significant impact on the structural and electronic properties of metals, insulators, and semiconductors. Despite the prevalence of hydrogen, little is known about its behavior in oxides such as strontium titanate (SrTiO3). In this work, hydrogen-related defects in SrTiO3 were investigated using infrared absorption spectroscopy. Two local vibrational modes (LVMs) are observed at ...