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This is a schematic representation of Ti4O7 (a) and γ-Ti3O5 (b). Credit: Scientific Reports

Many of us are familiar with titanium dioxide (TiO2), a whitener commonly used in sunscreens and paints such as the white lines seen on tennis courts. Less well known are other higher titanium oxides – those with a higher number of titanium and oxygen atoms than TiO – that are now the subject of intensifying research due to their potential use in next-generation electronic devices. Now, researchers at Tokyo Tech have reported superconductivity in two kinds of higher titanium oxides prepared in the form of ultrathin films. With a thickness of around 120nm, these materials reveal properties that are only just beginning to be explored.

“We succeeded in growing thin films of Ti4O7 and γ-Ti3O5 for the f...