  A rather unique feature of the two-dimensional electron gas (2-DEG) formed at
the interface between the two insulators LaAlO3 and SrTiO3 is to host both
gate-tunable superconductivity and strong spin-orbit coupling. In the present
work, we use the disorder generated by Cr substitution of Al atoms in LaAlO3 as
a tool to explore the nature of superconductivity and spin-orbit coupling in
these interfaces. A reduction of the superconducting Tc is observed with Cr
doping consistent with an increase of electron-electron interaction in presence
of disorder. In addition, the evolution of spin-orbit coupling with gate
voltage and Cr doping suggests a D'Yakonov-Perel mechanism of spin relaxation
in the presence of a Rashba-type spin-orbit interaction.
