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Magnetic field tuned superconductor-to-insulator transition at the LaAlO<inf>3</inf>/ SrTiO<inf>3</inf>interface
Mehta, MM Dikin, DA Bark, CW Ryu, S Folkman, CM Eom, CB Chandrasekhar, V
Mehta, MM
Dikin, DA
Bark, CW
Ryu, S
Folkman, CM
Eom, CB
Chandrasekhar, V
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Journal Article
Date
2014-09-22
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10.1103/PhysRevB.90.100506
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© 2014 American Physical Society. We present a study of the magnetic field tuned superconductor-to-insulator transition (SIT) in the electron gas that forms at the LaAlO3/SrTiO3interface. 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 zν≃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 ≈1.5 kΩ, much less than the quantum of resistance RQ≡h/4e2=6.45 kΩ.
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Physical Review B - Condensed Matter and Materials Physics
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