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                <term xml:lang="en">Field effect transistors</term>
                <term xml:lang="en">electric field</term>
                <term xml:lang="en">electron</term>
                <term xml:lang="en">high temperature</term>
                <term xml:lang="en">polarization</term>
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                <term xml:lang="en">Superconductivity</term>
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                <term xml:lang="en">crystal</term>
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                <term xml:lang="en">Doping (additives)</term>
                <term xml:lang="en">Atomic force microscopy</term>
                <term xml:lang="en">Cephalopoda</term>
                <term xml:lang="en">zirconium</term>
                <term xml:lang="en">Niobium</term>
                <term xml:lang="en">Oxides</term>
                <term xml:lang="en">lead</term>
                <term xml:lang="en">metal oxide</term>
                <term xml:lang="en">niobium</term>
                <term xml:lang="en">perovskite</term>
                <term xml:lang="en">strontium</term>
                <term xml:lang="en">strontium titanium oxide</term>
                <term xml:lang="en">titanium</term>
                <term xml:lang="en">unclassified drug</term>
                <term xml:lang="en">Magnetoresistance</term>
                <term xml:lang="en">Electronic correlations</term>
                <term xml:lang="en">Pinning centers</term>
                <term xml:lang="en">Superconducting wires</term>
                <term xml:lang="en">Zero resistance</term>
                <term xml:lang="en">electrical resistivity</term>
                <term xml:lang="en">superconductivity</term>
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              <p>Correlated oxides display a variety of extraordinary physical properties including high-temperature superconductivity1 and colossal magnetoresistance2. In these materials, strong electronic correlations often lead to competing ground states that are sensitive to many parameters - in particular the doping level - so that complex phase diagrams are observed. A flexible way to explore the role of doping is to tune the electron or hole concentration with electric fields, as is done in standard semiconductor field effect transistors3. Here we demonstrate a model oxide system based on high-quality heterostructures in which the ferroelectric field effect approach can be studied. We use a single-crystal film of the perovskite superconductor Nb-doped SrTiO3 as the superconducting channel and ferroelectric Pb(Zr,Ti)O3 as the gate oxide. Atomic force microscopy is used to locally reverse the ferroelectric polarization, thus inducing large resistivity and carrier modulations, resulting in a clear shift in the superconducting critical temperature. Field-induced switching from the normal state to the (zero resistance) superconducting state was achieved at a well-defined temperature. This unique system could lead to a field of research in which devices are realized by locally defining in the same material superconducting and normal regions with 'perfect' interfaces, the interface being purely electronic. Using this approach, one could potentially design one-dimensional superconducting wires, superconducting rings and junctions, superconducting quantum interference devices (SQUIDs) or arrays of pinning centres.</p>
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