Hierarchy of quantum corrections to resistivity of a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>γ</mml:mi> <mml:mtext>−</mml:mtext> <mml:msub> <mml:mi>Al</mml:mi> <mml:mn>2</mml:mn> </mml:msub> <mml:msub> <mml:mi mathvariant="normal">O</mml:mi> <mml:mn>3</mml:mn> </mml:msub>

A resistance upturn that occurs in SrTiO 3 -based two-dimensional electron gases at low temperatures is often attributed to Kondo scattering of carriers from localized spins. We show that the low-temperature transport behavior of the electron gas that forms at the γ − Al 2 O 3 / SrTiO 3 interface is governed by a whole hierarchy of quantum corrections in addition to the Kondo contribution. Upon cooling, the resistance shows a typical Kondo-like upturn, but then decreases due to weak antilocalization, and finally vanishes at the superconducting transition. When superconductivity is suppressed by applying a magnetic field or by reducing the carrier density, a logarithmic correction due to electron-electron interactions appears at millikelvin temperatures. These results show that the low-temperature resistance behavior cannot be accounted for by a Kondo-only interpretation, but requires consideration of several quantum corrections.