摘要
MgB2是2001年由日本J. Akimitsu教授實驗室首先發現的新超導材料。由於其具有比一般傳統金屬性超導幾乎2倍的超導臨界溫度、高度的實際應用性，加上此材料的晶格結構及電子結構特殊，其超導性質無法完全以BCS理論解釋，而引起各界的高度關注。
我們嘗試以兩階段方式成長MgB2膜於R-plane Al2O3上。首先以熱蒸鍍( Thermal Evaporator Deposition)和射頻磁控濺鍍(Radio Frequency Magnetron Sputtering Deposition)兩種鍍膜方式鍍出各種初級膜，再將初級膜置於高溫爐退火(annealing)處理。
接著，我們將這些成長於R-plane Al2O3的薄膜拿至同步輻射中心做X光吸收譜的實驗，得知由熱蒸鍍所得的硼膜品質相當的好，無氧化情形，但在退火處理後，卻未發現硼膜有所變化。而濺鍍靶材Mg -rich MgB2所得的初級膜含有少量的B2O3，經退火處理後，發現B2O3消失，反而出現MgO的訊號。
不過此樣品的B-edge吸收譜已接近MgB2 powder的吸收譜，故我們再嘗試不同的退火條件終於成功的製作出臨界溫度約30K的多晶(polycrystalline)MgB2膜。

參考資料
1-1 Nagamatsu, J., Nakagawa, N., Muranaka, T., Zenitani, Y. & Akimitsu, J. Nature 410, 63 (2001).
1-2 Hyeong-Jin Kim, W. N. Kang, Eun-Mi Choi, Mun-Seog Kim, Kijoon H. P. Kim, and Sung-Ik Lee,Phys. Rev. Lett. 87, 087002 (2001)
1-3 Hyoung Joon Choi, David Roundy, Hong Sun, Marvin L. Cohen & Steven G. Louie, Nature 418, 758 (2002)
1-4 H. Schmidt, J.F. Zasadzinski, K.E. Gray, and D.G. Hinks, Phys. Rev. B 63, 220504 (2001)
1-5 P. Seneor, C.-T. Chen, N.-C. Yeh, R. P. Vasquez, L. D. Bell, C. U. Jung, Min-Seok Park, Heon-Jung Kim, W. N. Kang, and Sung-Ik Lee, Phys. Rev. B 65, 012505 (2001)
1-6 S. L. Bud’ko, G. Lapertot, C. Petrovic, C. E. Cunningham, N. Anderson, and P. C. Canfield, Phys. Rev. Lett. 86, 1877 (2001)
1-7 Wang, Y., Plackowski, T. & Junod, Physica C 355, 179
1-8 Yang, H. D. et al. Phys. Rev. Lett. 87, 167003 (2001)
1-9 J.Kortus, I.I.Mazin, K.D.Belashchenko, V.P.Antropov, and L. L. Boyer, Phys. Rev. Lett. 86, 4656 (2001)
1-10 J. Kortusy, I.I. Maziny, K.D. Belashchenko,z V.P. Antropovz, L.L. Boyer, cond-matt, 0101446 (2001)
1-11 Warren Pickett, Nautre 418, 733 (2002)
2-1 W. N. Kang, Hyeong-Jin Kim, Eun-Mi Choi, C. U. Jung, Sung-Ik Lee. Science 292, 1521 (2001).
2-2 M.P. Paranthaman, D.K. Christen, H.M. Christen, J.R. Thompson,H.R. Kerchner, C. Cantoni, H.Y. Zhai Phys. C 378, 1252 (2002)
2-3 M. Paranthaman, C. Cantoni, H. Y. Zhai, H. M. Christen, T. Aytug, S. Sathyamurthy,E. D. Specht, J. R. Thompson, D. H. Lowndes, H. R. Kerchner, and D. K. Christen. Appl. Phys. Lett. 78, 3669 (2001)
3-1“ EXFAS,Basic Principle and Data Analysis”,edited by Boon K.Teo (Springer-Verlag 1986)
3-2“X-ray Spectroscopy”, B. K. Agarwal, 2nd Edition, Springer Series in Optical Sciences, Vol. 15, Spring-Verlag, 1989.
3-3 “X-ray Data Booklet”, D. Vaughan (Editor), Center for X-ray Optics, Lawrence Berkeley Laboratory, 1986.
4-1 F. M. F. de Groot, M. Grioni and J. C. Fuggle, Phys. Rev. B 40, 5715 (1989).
4-2 J.J. Jia, J.H. Underwood, E. M. Gullikson, T. A. Callcott, and R. C. C. Perera, J. Electron Spectrosc. Relat. Phenom. 80, 509 (1996)
4-3 Jin Nakamura, Nobuyoshi Yamada, Kazuhiko Kuroki, Thomas A. Callcott, David L. Ederer, Jonathan D. Denlinger and Ruper C. C. Perera , Phys Rev. B 64 ,174504 (2001)
4-4 T. A. Callcott, L. Lin, G.T. Woods, G.P. Zhang, J.R. Thompson, M. Paranthaman, and D. L. Ederer, Phys. Rev. B 64, 132504 (2001)