کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9841955 | 1525810 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Local electronic structure, O-T phase transition and oxygen content in Y0.8Ca0.2Ba2Cu3Oy (y = 6.84 â 6.32) high-Tc superconductors
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Y0.8Ca0.2Ba2Cu3Oy samples with large range of oxygen content, have been systematically studied by means of positron annihilation technology, transport property measurements and X-ray diffraction. The positron lifetime parameters have a strong dependence on oxygen content y, and show evident changes during orthorhombic-tetragonal phase transition (y = 6.50 ± 0.05). The local electron density ne and vacancy concentration Cv are evaluated as a function of oxygen content. The correlations between local electronic structure, O-T phase transition and superconductivity are discussed. ne mainly has an effect on high-Tc superconductivity, no direct evidence shows that it is related to the O-T phase transition; and Cv is mainly caused by oxygen vacancy. The small increase of Tc with decreasing y around y â¼Â 6.80 is due to the charge carriers over-doping, which is confirmed by the change of ne in this work.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity - Volume 418, Issues 1â2, 15 January 2005, Pages 43-48
Journal: Physica C: Superconductivity - Volume 418, Issues 1â2, 15 January 2005, Pages 43-48
نویسندگان
Lingwei Li, Shixun Cao, Fen Liu, Wenfeng Li, Changyun Chi, Chao Jing, Jincang Zhang,