Magnetic Field Tuned Superconductor-To-Insulator Transition At The Laalo3/Srtio3 Interface

We present a study of the magnetic field tuned superconductor-to-insulator transition (SIT) in the electron gas that forms at the LaAlO3/SrTiO3 interface. We find that the magnetic field induces a transition into a weakly insulating state, as is observed for the electrostatically tuned SIT at this interface. Finite size scaling of the magnetoresistance yields the critical exponent product z upsilon similar or equal to 7/3, indicating that the transition is governed by quantum percolation effects. While such critical exponents have been reported previously for high resistance films, they have not been reported for a low resistance system like ours, with a maximum sheet resistance of approximate to 1.5 k Omega , much less than the quantum of resistance R-Q = h/4e(2) = 6.45 k Omega