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Oxygen nonstoichiometry effect on structural modulation in Bi-2212 cuprate superconductors |
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| Authors: | F Munakata T Kawano and H Yamauchi Y Inoue |
| Institution: | Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13 Shinonome 1-Chome, Kotoku, Tokyo 135, Japan Central Engineering Laboratories, Nissan Motor Co., Ltd., 1 Natsushima-cho, Yokosuka, Kanagawa 237, Japan |
| Abstract: | The X-ray diffraction patterns for Bi2Sr2Ca1?xYxCu2O8+y sintered in air or Ar indicated that the reduction in the number of excess oxygen ions induced a structural change from orthorhombic to pseudotetragonal. When the oxygen contents decreased with the reducing treatment, the period of modulation in Bi2Sr2Ca1?xYxCu2O8+y increased. This result supported the model of excess oxygen ions in the Bi---O sheet. However, it was difficult to understand the change of modulation period with increasing Y contents using the model of excess oxygen ions in the Bi---O layers. Also, it is included that the Y substitution for Ca and La substitution for Sr in the Bi2Sr2CaCu2O8+y system result in parallel effects for the modulation structure. |
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