کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1820878 1026114 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Vortex pinning and modulated microwave absorption in thin HTSC films
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Vortex pinning and modulated microwave absorption in thin HTSC films
چکیده انگلیسی
We present the results of the experimental and theoretical investigation of the modulated microwave absorptions (MMWA) in the Bi2Sr2CaCu2O8 thin film with columnar defects. The dependence of the MMWA hysteresis loop on the applied magnetic field and the modulation amplitude was studied. It is found that the hysteresis has unusual properties, in particular, (i) the amplitude falls down when the magnetic field increases whereas the critical current density is nearly constant; (ii) the hysteresis changes the sign when the modulation amplitude increases. These features can be explained if one takes into account that in thin superconducting films (d ⩽ λ) each vortex interacts with a limited number of pinning centers with a different coordination (gradient). We develop the theoretical model of the MMWA hysteresis in a thin superconductor with regard to these peculiarities. Five possible types of pinning centers are considered. It is shown that the vortices pinned on the centers of different type can make opposite contributions to MMWA. Good agreement between calculated theoretical curves and experimental data has been obtained.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity and its Applications - Volume 451, Issue 2, 15 January 2007, Pages 90-97
نویسندگان
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