کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9841833 | 1525800 | 2005 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of Sr/Ba substitution in Gd1âxPrxBaSrCu3O7âδ
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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: Effect of Sr/Ba substitution in Gd1âxPrxBaSrCu3O7âδ Effect of Sr/Ba substitution in Gd1âxPrxBaSrCu3O7âδ](/preview/png/9841833.png)
چکیده انگلیسی
Tetragonal Gd1âxPrxBaSrCu3O7âδ (0 ⩽ x ⩽ 1) polycrystalline samples have been prepared by the standard solid-state reaction, and characterized by XRD and SEM. Resistance measurements and XRD patterns show site mixing between rare earth R and Sr is less than R and Ca. Contrary to Gd1âxPrxBa2Cu3O7âδ, a hump on the Ï(T) curve is observed at about 80 K. Based on the resistivity measurements, the effect of Pr substitution in the 1113 structure, in comparison with the 123 structure, on the increase of pseudogap temperature is investigated. The normal state resistivity has been analyzed by the two and three dimensional variable range hopping (2D-VRH and 3D-VRH) and Coulomb gap. For the low concentration of Pr (x < 0.5-0.6, corresponding to the metal-insulator transition), the 2D-VRH is the dominant mechanism, but with the increase of x, the 3D-VRH becomes dominant. The magnetic critical fields are investigated through resistance and magnetoresistance. Samples with Sr have higher pinning energy and critical field compared to the samples with Ca. Also, substitution of Ba by Sr or Ca, causes a strong increase in the superconducting granularity. The magnetoresistance measurements have been analyzed by the Ambegaokar and Halperin phase slip model. The field dependences of the pinning energy and critical current density have been studied for different amounts of Pr doping.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity and its Applications - Volume 423, Issues 3â4, 15 July 2005, Pages 163-174
Journal: Physica C: Superconductivity and its Applications - Volume 423, Issues 3â4, 15 July 2005, Pages 163-174
نویسندگان
M. Kariminezhad, M. Akhavan,