Recent technological advances have allowed researchers to make exceptionally high-quality, thin, metal oxide films, spurring new experiments. One such experiment revealed superconducting behavior in a roughly 30-nm-thick layer of ruthenium oxide (RuO2)—but only when it was grown on a suitably oriented titanium dioxide (TiO2) substrate. Now, Masaki Uchida at the University of Tokyo and colleagues have identified the cause of this behavior [1]. Their finding could provide a starting point for inducing superconductivity in other metal oxide films.
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