کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9841766 | 1525795 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Role of impurity oxygen in superconductivity of “non-doped” Tâ²-(La, RE)2CuO4
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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: Role of impurity oxygen in superconductivity of “non-doped” Tâ²-(La, RE)2CuO4 Role of impurity oxygen in superconductivity of “non-doped” Tâ²-(La, RE)2CuO4](/preview/png/9841766.png)
چکیده انگلیسی
We have systematically investigated the effect of oxygen non-stoichiometry in a nominally undoped superconductor Tâ²-(La, Y)2CuO4+y. In the experiments, the reduction condition was changed after the sample growth by MBE. The superconductivity is very sensitive to the reduction condition. With systematically increasingly reduced atmospheres, resistivity shows a continuous drop and no discontinuity is observed even until the appearance of superconductivity. The absence of the highly insulating state expected for Mott insulators around y â¼Â 0 suggests that Tâ²-(La, Y)2CuO4 has intrinsic carriers. The role of residual apical oxygen, which is detrimental to superconductivity, is also discussed based on the resistivity-temperature characteristics in insufficiently reduced samples.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity - Volumes 426â431, Part 1, 1 October 2005, Pages 459-463
Journal: Physica C: Superconductivity - Volumes 426â431, Part 1, 1 October 2005, Pages 459-463
نویسندگان
A. Tsukada, M. Noda, H. Yamamoto, M. Naito,