Electrostatically-tuned superconductor-metal-insulator quantum transition at the LaAlO3/SrTiO3 interface
T. Schneider, A. D. Caviglia, S. Gariglio, N. Reyren, J.-M. Triscone
DOI 10.1103/PhysRevB.79.184502 · Physical Review B
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Abstract
Recently superconductivity at the interface between the insulators LaAlO3 and SrTiO3 has been tuned with the electric-field effect to an unprecedented range of transition temperatures. Here we perform a detailed finite-size scaling analysis to explore the compatibility of the phase-transition line with Berezinskii-Kosterlitz-Thouless (BKT) behavior and a two-dimensional–quantum-phase (2D-QP) transition. In an intermediate regime, limited by a gate voltage dependent limiting length, we uncover remarkable consistency with a BKT-critical line ending at a metallic quantum critical point, separating a weakly localized insulator from the superconducting phase. Our estimates for the critical exponents of the 2D-QP-transition, z≃1 and ν¯≃2/3, suggest that it belongs to the three-dimensional-xy universality class.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaAlO3/SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.31 | Pressure not reported | onset |
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