| Original Articles |
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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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| Cite this article: |
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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.
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| Keywords:
74.70.-b
74.70.Ad
74.81.Bd
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Received: 12 February 2007
Published: 17 May 2007
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| PACS: |
74.70.-b
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(Superconducting materials other than cuprates)
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74.70.Ad
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(Metals; alloys and binary compounds)
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74.81.Bd
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(Granular, melt-textured, amorphous, and composite superconductors)
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