کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5492282 | 1525675 | 2017 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optical investigation of niobium properties: Electrical- and physical constants
ترجمه فارسی عنوان
بررسی نوری از خواص نیببی: ثابت های الکتریکی و فیزیکی
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
چکیده انگلیسی
In this paper, we report optical (reflectance) measurements and investigations of optical properties of electropolished (EP), buffered chemical polished (BCP), and as-received (AR) from vendor niobium (Nb) samples typically used for fabrication of superconducting radio frequency (SCRF) cavities. Optical conductivity (Ï(0), approximated near zero frequency) of EP (Ï(0) â¼ 9 à 103 Ωâ1 cmâ1) sample is one order of magnitude higher than that of BCP (Ï(0) â¼ 7 à 102 Ωâ1 cmâ1) and AR (Ï(0) â¼ 3 à 102 Ωâ1 cmâ1) niobium samples. Furthermore, physical constants of electropolished Nb-SCRF materials such as concentration of conduction electrons ( â¼ 1.8 à 1022 electrons/cm3), average velocity ( â¼ 5.9 à 107 cm/s) of the electrons on the Fermi surface, and mean free path ( â¼ 0.53ânm) were also found to be considerably higher than that of the BCP and the AR samples. The depth of electric field penetration (in low frequency region) in the electropolished Nb sample ( â¼ 80ânm) is appreciably lesser than the BCP ( â¼ 450ânm) and the AR ( â¼ 400ânm) samples.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity and its Applications - Volume 539, 15 August 2017, Pages 1-7
Journal: Physica C: Superconductivity and its Applications - Volume 539, 15 August 2017, Pages 1-7
نویسندگان
Nageshwar Singh, M.N. Deo, S.B. Roy,