Effect of cation-nonstoichiometry in the SrTiO$_{3}$ layer on the interfacial conductance of LaAlO$_{3}$/SrTiO$_{3}$ heterostructures
ORAL
Abstract
A study of the interface conductivity in LaAlO$_{3}$/SrTiO$_{3}$ (LAO/STO) heterostructures will be presented with focus on the defect chemical state of the SrTiO$_{3}$ close to the interface. SrTiO$_{3}$ layers with a controlled deviation from cation stoichiometry (Sr/Ti=1) were grown to investigate the effect of cation-nonstoichiometry in the SrTiO$_{3}$ layer on the resulting interface conductance of the corresponding LAO/STO heterostructures. The study comprises structural information and electrical properties derived from Hall measurements and high-temperature conductance measurements performed under equilibrium oxygen atmospheres. According to the model of defect chemistry the results give further evidence for the importance of charge compensation through defects on cation lattice sites.
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