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
![عکس صفحه اول مقاله: Local electronic structure, O-T phase transition and oxygen content in Y0.8Ca0.2Ba2Cu3Oy (y = 6.84 â 6.32) high-Tc superconductors Local electronic structure, O-T phase transition and oxygen content in Y0.8Ca0.2Ba2Cu3Oy (y = 6.84 â 6.32) high-Tc superconductors](/preview/png/9841955.png)
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,