Phase diagram of electrostatically doped Strontium Titanate (SrTiO3)

Abstract

Electric double layer transistor configurations have been employed to electrostatically dope single crystals of insulating SrTiO_{3}. Here we report on the results of such doping over broad ranges of temperature and carrier concentration employing an ionic liquid as the gate dielectric. The surprising results are, with increasing carrier concentration, an apparent carrier-density dependent conductor-insulator transition, a regime of anomalous Hall effect, suggesting magnetic ordering, and finally the appearance of superconductivity. The possible appearance of magnetic order near the boundary between the insulating and superconducting regimes is reminiscent of effects associated with quantum critical behavior in some complex compounds.

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• Persistent Optically Induced Magnetism in Oxygen-Deficient Strontium Titanate
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• Correlated Electron Materials and Field Effect Transistors for Logic: A Review
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• Quantum longitudinal and Hall transport at the LaAlO3/SrTiO3 interface at low electron densities
• Direct Imaging of Nanoscale Conductance Evolution in Ion-Gel-Gated Oxide Transistors
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• Probing the electric field-induced doping mechanism in YBa2Cu3O7 using computed Cu K-edge x-ray absorption spectra
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• On the formation of a conducting surface channel by ionic liquid gating of an insulator
• Sign-changing non-monotonic voltage gain of HfO2/Parylene-C/SrTiO3 field-effect transistor due to percolative insulator to two-dimensional metal transition
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• Divergence of Dynamical Conductivity at Certain Percolative Superconductor-Insulator Transitions