Chin. Phys. Lett.  2007, Vol. 24 Issue (6): 1713-1716    DOI:
Original Articles |
Microwave Response of MgB2/Al2O3 Superconducting Thin Films by Microstrip Resonator Technique
SHI Li-Bin;ZHENG Yan;REN Jun-Yuan;LI Ming-Biao;ZHANG Feng-Yun;LI Bo-Xin;DONG Hai-Kuan
Department of Physics, Bohai University, Jinzhou 121000
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SHI Li-Bin, ZHENG Yan, REN Jun-Yuan et al  2007 Chin. Phys. Lett. 24 1713-1716
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Abstract Double-sided superconducting MgB2 thin films are deposited onto c-Al2O3 substrates by the hybrid physical chemical vapour deposition method. The microwave response of MgB2/Al2O3 is investigated by microstrip resonator
technique. A grain-size model is introduced to the theory of microstrip resonators to analyse microwave properties of the films. We obtain effective penetration depth of the films at 0K (λe0=463nm) and surface resistance (Rs=1.52mΩ at 11K and 8.73GHz) by analysing the resonant frequency and unload quality factor of the microstrip resonator, which suggests that the impurities and disorders of grain boundaries of MgB2/Al2O3 result in increasing penetration depth and surface resistance of the films.
Keywords: 74.70.-b      74.70.Ad      74.81.Bd     
Received: 12 February 2007      Published: 17 May 2007
PACS:  74.70.-b (Superconducting materials other than cuprates)  
  74.70.Ad (Metals; alloys and binary compounds)  
  74.81.Bd (Granular, melt-textured, amorphous, and composite superconductors)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2007/V24/I6/01713
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SHI Li-Bin
ZHENG Yan
REN Jun-Yuan
LI Ming-Biao
ZHANG Feng-Yun
LI Bo-Xin
DONG Hai-Kuan
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