Abstract
We carried out surface cleaning of Bi2Sr2CaCu2Oy (Bi-2212) single crystals grown by a modified vertical Bridgman method (modified VB method), and investigated the chemical state with X-ray photoelectron spectroscopy. From the results, we found that carbon impurities on the surface of the single crystals can be removed almost completely by cleaving them under high vacuum (7.3 × 10-6 Pa). The O-1s peak from the cleaved surface of the single crystal was very sharp and its FWHM value was about 2.0 eV. Moreover, we found that the crystals do not include any carbon impurities, and that they have few mutual substitutions between Ca and Sr. Therefore, the single crystals grown by a modified VB method is found to have high quality.
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