کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1819143 | 1026049 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The study on the ZnO and Zn0.95Mn0.05O added YBCO system: Investigation of microstructure and transport properties
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The effect of nano-size Zn0.95Mn0.05O and ZnO (30Â nm) addition on the microstructure and the normal state transport properties of polycrystalline YBa2Cu3Oy (YBCO) was systematically studied. Samples were synthesized in air using a standard solid state reaction technique by adding nano-sized particles up to 10Â wt.%. When Zn0.95Mn0.05O and ZnO are added to the YBCO the orthorhombic structure maintained even at the highest concentration. TEM and EDS analyses show the presence of inhomeginities embedded in the superconducting matrix. To interpret the normal state properties of the samples, the percolation theory based on localized states is applied. A cross-over between variable-range hopping and Coulomb gap mechanisms is observed as a result of increasing the nano-particles concentration. The ZnO addition modifies the electrical behavior of samples from metallic to insulating with a much lower concentration comparatively to Zn0.95Mn0.05O addition. The calculated values of the localization length, d, are greater in the case of Zn0.95Mn0.05O addition. This result can be interpreted by the internal structure defects.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity - Volume 470, Issue 4, 15 February 2010, Pages 262-268
Journal: Physica C: Superconductivity - Volume 470, Issue 4, 15 February 2010, Pages 262-268
نویسندگان
I. Bouchoucha, F. Ben Azzouz, M. Annabi, M. Zouaoui, M. Ben Salem,