Abstract
We treated Bi2Sr2CaCu2Oy (BSCCO) superconducting single crystals at various temperatures in air and investigated their surfaces with X-ray photoelectron spectroscopy. From the results, we determined that the carbon and oxygen impurities on the surfaces of BSCCO single crystals were removed by heating them in air at 400°C for 1 h. This was also confirmed by an Auger electron spectroscopy. In addition, the results of the half-width of the Cu-2p main peak and the intensity ratio of satellite to main peaks indicated that the optimum heat treatment temperature for obtaining a clean surface of BSCCO single crystal was approximately 400°C. The method is thought to be effective for cleaning the surfaces of superconducting oxides with various formations.
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