Abstract
In order to obtain the clean surfaces of Bi2Sr2CaCu2Oy (BSCCO) single crystals, we heated them in air, Ar gas and O2 gas, and measured them by X-ray photoelectron spectroscopy (XPS). From the results, we found that the carbon and impurity oxygen on the surfaces of BSCCO single crystals were removed by the heat-treatments in air and O2 gas, and that chemical bond natures of Cu and O were not changed.
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