種々の雰囲気におけるBi_2Sr_2CaCu_2O_y 単結晶表面の加熱処理効果 Effect of Heat-treatments in Various Atmospheres on Bi_2Sr_2CaCu_2O_y Single Crystal Surfaces
We prepared Bi<SUB>2</SUB>Sr<SUB>2</SUB>CaCu<SUB>2</SUB>O<SUB>y</SUB> (BSCCO) single crystals by a self flux method and heated them in air, Ar gas and O<SUB>2</SUB> gas. Then, we investigated their surface compositions and chemical bond natures of constituent elements by the X-ray photoelectron spectroscopy (XPS). From the results, we found that the carbon and the impurity oxygen on the BSCCO single crystal surfaces were efficiently removed by the heat-treatments in air and O<SUB>2</SUB> gas, and that the chemical bond natures of Cu, Sr and O did not change.
真空 42(3), 171-174, 1999-03
The Vacuum Society of Japan