کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8164568 | 1525709 | 2014 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Frequency dependence of the microwave surface resistance of MgB2 by coaxial cavity resonator
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
We report on the microwave (mw) properties of a cylindrical MgB2 rod prepared by the reactive liquid Mg infiltration technology. The MgB2 rod, 94.3 mm long, is used as inner conductor of a coaxial cavity having a Cu tube as external conductor. By analyzing the resonance curves of the cavity in the different resonant modes and at different temperatures, we have determined the temperature dependence of the mw surface resistance, Rs, of the MgB2 material, at fixed frequencies, and the frequency dependence of Rs, at fixed temperatures. Our results show that the Rs(f) curves follow a fn law, where n decreases on increasing the temperature, starting from nâ2, at T=4.2K, down to nâ0.7 at T⩾Tc. The double-gap nature of MgB2 manifests itself in the presence of a wide low-T tail in the Rs(T) curves, which can be ascribed to the quasiparticles thermally excited through the Ï gap even at relatively low temperatures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity and its Applications - Volume 503, 15 August 2014, Pages 150-153
Journal: Physica C: Superconductivity and its Applications - Volume 503, 15 August 2014, Pages 150-153
نویسندگان
A. Agliolo Gallitto, P. Camarda, M. Li Vigni, A. Figini Albisetti, G. Giunchi,