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Stoichiometry control of the electronic properties of the LaAlO_3/SrTiO_3 heterointerface

We investigate the effect of the laser parameters of pulsed laser deposition on the film stoichiometry and electronic properties of LaAlO_3/SrTiO_3 (001) heterostructures. The La/Al ratio in the LaAlO_3 films was varied over a wide range from 0.88 to 1.15, and was found to have a strong effect on the interface conductivity. In particular, the carrier density is modulated over more than two orders of magnitude. The film lattice expansion, caused by cation vacancies, is found to be the important functional parameter. These results can be understood to arise from the variations in the electrostatic boundary conditions, and their resolution, with stoichiometry.

preprint2013arXivOpen access
H. K. SatoC. BellY. HikitaH. Y. Hwang
cond-mat.mtrl-sci
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H. K. SatoC. BellY. HikitaH. Y. Hwang

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