کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1861338 1037506 2008 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Manifestation of vortex depinning transition in nonlinear current–voltage characteristics of polycrystalline superconductor Y1−xPrxBa2Cu3O7−δ
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک و نجوم (عمومی)
پیش نمایش صفحه اول مقاله
Manifestation of vortex depinning transition in nonlinear current–voltage characteristics of polycrystalline superconductor Y1−xPrxBa2Cu3O7−δ
چکیده انگلیسی

We present our recent results on the temperature dependence of current–voltage characteristics for polycrystalline Y1−xPrxBa2Cu3O7−δ superconductors with x=0.0x=0.0, 0.1 and 0.3. The experimental results are found to be reasonably well fitted for all samples by a power like law of the form V=R(I−Ic)a(T)V=R(I−Ic)a(T). Here, we assume that a(T)=1+Φ0IC(T)/2πkBTa(T)=1+Φ0IC(T)/2πkBT and IC(T)=IC(0)(1−T/TC)3/2IC(T)=IC(0)(1−T/TC)3/2 for the temperature dependences of the power exponent and critical current, respectively. According to the theoretical interpretation of the obtained results, nonlinear deviation of our current–voltage characteristics curves from Ohmic behavior (with a(TC)=1a(TC)=1) below TCTC is attributed to the manifestation of dissipation processes. They have a characteristic temperature TpTp defined via the power exponent as a(Tp)=2a(Tp)=2 and are related to the current induced depinning of Abrikosov vortices. Both TC(x)TC(x) and Tp(x)Tp(x) are found to decrease with an increase of Pr concentration x reflecting deterioration of the superconducting properties of the doped samples.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters A - Volume 372, Issue 30, 21 July 2008, Pages 5089–5092
نویسندگان
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