Van der Waals Gaps in Sm1+x Ba2−x Cu3O y and Their Effect on Superconductivity
Tóm tắt
We have used electron–positron annihilation to study superconducting cuprates Sm1+x Ba2−x Cu3O y . We have determined the average radii for oxygen ions in Sm1+x Ba2−x Cu3O y . Taking into account the ion coordinates and their radii, we have constructed a geometric model for the arrangement of copper and oxygen ions in CuO2 layers in the [b, c] plane, responsible for the superconductivity. From these data, we have determined the length of the ionic/covalent bonds and the width of the interionic gaps. We have established the effect of the features of the atomic structure of Sm1+x Ba2−x Cu3O y on the superconducting transition temperature T c and we have shown that T c increases as ΔX inceases.
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