| Description |
“Transition-metal oxides are known to provide rich physical properties such as metal-insulator transition, high-temperature superconductivity, giant magnetoresistance, and ferroelectricity. Recently, it has been found that some atomically flat interfaces between two different oxides exhibit fundamentally different physical properties from either side: for example, metallic conductivity (and even superconductivity) between two insulating oxides, and ferromagnetism between two non-magnetic oxides. In order to detect and characterize such novel electronic phases at the interfaces and to elucidate the mechanism leading to the remarkable properties, various spectroscopic methods have been applied so far. We have applied photoemission spectroscopy to study those interfaces and obtained crucial information. In particular, "electronic reconstruction", i.e.,
large-scale charge redistribution, is shown to occur and to alter the physical properties of the interfaces.”
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