کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1818875 | 1525757 | 2010 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
1/f Noise in the superconducting transition of a MgB2 thin film
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The noise voltage spectral density in the superconducting transition of a MgB2 thin film on a SiN-coated Si thick substrate was measured over the frequency range 1Â Hz-to-1Â KHz. Using established bolometer noise theory the theoretical noise components due to Johnson, 1/f (excess) and phonon noise are modeled to the measured data. It is shown that for the case of a MgB2 thin film in the vicinity of the mid-point of transition, coupled to a heat sink via a fairly high thermal conductance (â10â1Â W/K) that the measured noise voltage spectrum is 1/f limited and exhibits 1/fa dependence with a varying between 0.3 and 0.5 in the measured frequency range. At a video frame rate frequency of 30Â Hz the measured noise voltage density in the film is â61nV/Hz, using this value an upper limit of electrical NEPâ0.67pW/Hz is implied for a practical MgB2 bolometer operating at 36.1Â K.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity - Volume 470, Issues 9â10, 1 May 2010, Pages 451-455
Journal: Physica C: Superconductivity - Volume 470, Issues 9â10, 1 May 2010, Pages 451-455
نویسندگان
B. Lakew, S. Aslam, H. Jones, T. Stevenson, N. Cao,