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High Mobility in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>LaAlO</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mi>SrTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>Heterostructures: Origin, Dimensionality, and Perspectives
We have investigated the dimensionality and origin of the magnetotransport properties of ${\mathrm{LaAlO}}_{3}$ films epitaxially grown on ${\mathrm{TiO}}_{2}$-terminated ${\mathrm{SrTiO}}_{3}\left(001\right)$ substrates. High-mobility conduction is observed at low deposition oxygen pressures (${P}_{\mathrm{O}2}<{10}^{\ensuremath{-}5}\text{ }\text{ }\mathrm{mbar}$) and has a three-dimensional character. However, at higher ${P}_{\mathrm{O}2}$ the conduction is dramatically suppressed and nonmetallic behavior appears. …