کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1820234 | 1525768 | 2008 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Change of strength of vortex pinning in YBCO due to BaZrO3 inclusions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
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چکیده انگلیسی
We probe the short-range pinning properties with the application of microwave currents at very high driving frequencies (47.7 GHz) on YBa2Cu3O7âδ films with and without sub-micrometer BaZrO3 inclusions. We explore the temperature and field ranges 60 K < T < Tc and 0 <μ0H < 0.8 T, with the field applied along the c-axis. The magnetic field induces a much smaller increase of the microwave resistivity, ÎÏ1(H)+iÎÏ2(H), in YBa2Cu3O7âδ/BaZrO3 with respect to pure YBa2Cu3O7âδ. ÎÏ1(H) is slightly superlinear in pure YBa2Cu3O7âδ (suggesting a possible contribution of thermal activation), but linear or sublinear in YBa2Cu3O7âδ/BaZrO3 (suggesting a possible suppression of thermal activation as a consequence of BaZrO3 inclusions). These features persist up to close to Tc. We discuss our data in terms of the ratio r=ÎÏ2(H)/ÎÏ1(H) in the framework of the models for the microwave surface impedance in the mixed state. Large r are found in YBa2Cu3O7âδ/BaZrO3, with little field dependence. By contrast, smaller values and stronger field dependences are found in pure YBa2Cu3O7âδ. We discuss the different field dependence of the pinning constant.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity and its Applications - Volume 468, Issues 7â10, 1 April 2008, Pages 745-748
Journal: Physica C: Superconductivity and its Applications - Volume 468, Issues 7â10, 1 April 2008, Pages 745-748
نویسندگان
N. Pompeo, V. Galluzzi, R. Rogai, G. Celentano, E. Silva,