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• W2136934181 abstract "High-temperature interface superconductivity, confined to nanometre-size interfaces between two non-superconducting materials, has been long sought-after. Theorists speculated about it for forty years, but it has been elusive because of extreme demands on interface perfection and materials parameters. Gozar et al. now report the discovery of interface superconductivity between two non-superconducting cuprates — an insulator (La2CuO4) and a metal (La1.55Sr0.45CuO4). The critical tempeature (Tc) in bilayers is about 15 K or 30 K, depending on the layering sequence. This highly robust phenomenon is confined to within 2 or 3 nanometres of the interface, and if the bilayer is exposed to ozone, Tc rises to over 50 K. The realization of high-transition-temperature (high-Tc) superconductivity confined to nanometre-sized interfaces has been a long-standing goal because of potential applications1,2 and the opportunity to study quantum phenomena in reduced dimensions3,4. This has been, however, a challenging target: in conventional metals, the high electron density restricts interface effects (such as carrier depletion or accumulation) to a region much narrower than the coherence length, which is the scale necessary for superconductivity to occur. By contrast, in copper oxides the carrier density is low whereas Tc is high and the coherence length very short, which provides an opportunity—but at a price: the interface must be atomically perfect. Here we report superconductivity in bilayers consisting of an insulator (La2CuO4) and a metal (La1.55Sr0.45CuO4), neither of which is superconducting in isolation. In these bilayers, Tc is either ∼15 K or ∼30 K, depending on the layering sequence. This highly robust phenomenon is confined within 2–3 nm of the interface. If such a bilayer is exposed to ozone, Tc exceeds 50 K, and this enhanced superconductivity is also shown to originate from an interface layer about 1–2 unit cells thick. Enhancement of Tc in bilayer systems was observed previously5 but the essential role of the interface was not recognized at the time." @default.
• W2136934181 created "2016-06-24" @default.
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• W2136934181 date "2008-10-01" @default.
• W2136934181 modified "2023-10-01" @default.
• W2136934181 title "High-temperature interface superconductivity between metallic and insulating copper oxides" @default.
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• W2136934181 doi "https://doi.org/10.1038/nature07293" @default.
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