分子束磊晶及電子槍蒸鍍準備之鋁薄膜的超導特性研究

葉茂榮

doi:10.6342/NTU.2009.00236

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分子束磊晶及電子槍蒸鍍準備之鋁薄膜的超導特性研究

Superconductivity in aluminum films prepared by MBE and electron gun evaporation

葉茂榮 , Masters　　Advisor：梁啟德　　

英文 DOI： 10.6342/NTU.2009.00236

分子束磊晶；電子槍蒸鍍；鋁薄膜；尺寸效應；顆粒效應；電子侷限效應； MBE ； E-gun ； Al film ； size effect ； granular effect ； electron localization

Abstract │ Reference (95) │ Altmetrics

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In the first part of this thesis, we describe preparation and measurements of use MBE-grown Al thin films with four different thicknesses (12, 16, 20 and 60 nm) and then present the information from AFM and XRD patterns of the flims we judge the structures of the four films. Furthermore, by studying superconductivity of the films and comparing the experimental results with the previous theories we analyze the details of the Al structures. We had measured the normal resistivity  , the critical temperature Tc, the critical filed Hc, the critical current density Jc as the judging parameters and calculated the mean free path l by Drude model and several corrections to discuss the homogeneity of the structures. We also observe the variation of the superconducting classification with different corrections of l and discovery that the mean free path indeed influences the classification by altering the penetration depth and the coherence length. The corrections of l are in consideration of size effect, granular boundary scattering, electron localization, etc. In the second part of this thesis, we describe preparation and measurements of E-gun-grown Al thin films with two different thicknesses (30 and 60 nm) and undertake the same research as that done on the MBE-grown films. Finally, we compare the structures and superconductivity of the MBE and E-gun films. We suggest that the grains of the E-gun-prepared films are more complete and smaller.

Reference ( 95 ) 〈TOP〉

Chapter 1
連結：
[1] Charles P. Poole, Jr., Horacio A. Farach, and Richard J. Creswick, in “Superconductivity”, Chap. 2, Academic Press, 1995.
連結：
[3] C. Kittle, in “Introduction to Solid State Physics 8/e”, Chap. 10, John Wiley & Sons, Inc., 1976.
連結：
[5] Charles P. Poole, Jr., Horacio A. Farach, and Richard J. Creswick, in “Superconductivity”, Chap. 1, Academic Press, 1995.
連結：
[12] Charles P. Poole, Jr., Horacio A. Farach, and Richard J. Creswick, in “Superconductivity”, Chap. 4, Academic Press, 1995.
連結：

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