Structural and superconducting properties of ion beam sputtered Nb thin films and Nb/Cu bilayers
作者： S.K. Nath , R. Dhawan , S. Rai , G.S. Lodha , K.J.S. Sokhey
DOI: 10.1016/J.PHYSC.2011.09.016
关键词:
摘要: Abstract We present the results of a study structural and superconducting properties polycrystalline Nb thin films (200 A, 300 A, 400 A, 700 A 1000 A) Nb/Cu bilayers (300 A/300 A 400 A/300 A) prepared on Si substrates by ion beam sputtering at room temperature. The thicknesses, roughnesses surfaces interfaces were determined X-ray reflectivity whereas grain sizes from grazing incidence diffraction transmission electron microscopic studies. transition temperature ( T C ) are smaller than bulk Nb. Nb-200 A sample does not show down to 2.3 K. average size grains varies 42 A for 69 A Nb-1000 A sample. Our that in these is only limited its thickness but also grains. deposited situ Cu layer (Nb/Cu) marginal increase as compare their respective values same thicknesses. As result observed. maximum decrease due oxygen intake during deposition should be about 0.5 K value (9.28 K). have attributed large our case basis Debye density states Fermi level compared
harvard.edu
elsevier.com
sci-hub.se 参考文章(38)
A. I. Gubin, K. S. Il’in, S. A. Vitusevich, M. Siegel, N. Klein, Dependence of magnetic penetration depth on the thickness of superconducting Nb thin films Physical Review B. ,vol. 72, pp. 064503- ,(2005) , 10.1103/PHYSREVB.72.064503
J. Tuckmantel, The LEP2 superconducting RF system IEEE Transactions on Applied Superconductivity. ,vol. 9, pp. 270- 275 ,(1999) , 10.1109/77.783288
Hasan Padamsee, The science and technology of superconducting cavities for accelerators Superconductor Science and Technology. ,vol. 14, ,(2001) , 10.1088/0953-2048/14/4/202
S. Calatroni, 20 Years of experience with the Nb/Cu technology for superconducting cavities and perspectives for future developments Physica C-superconductivity and Its Applications. ,vol. 441, pp. 95- 101 ,(2006) , 10.1016/J.PHYSC.2006.03.044
C. Benvenuti, S. Calatroni, I.E. Campisi, P. Darriulat, M.A. Peck, R. Russo, A.-M. Valente, Study of the surface resistance of superconducting niobium films at 1.5 GHz Physica C-superconductivity and Its Applications. ,vol. 316, pp. 153- 188 ,(1999) , 10.1016/S0921-4534(99)00207-5
L. Nevot, P. Croce, Characterization of surfaces by grazing X-ray reflection: Application to the study of the polishing of various silicate glasses Rev.Phys.Appl.. ,vol. 15, pp. 761- 779 ,(1980)
Dou S X, Zhao Y, Kawakami T, Nakayama Y, Maeda M, Kobayashi H, Kubota Y, 高密度MgB 2 バルクに関する大気圧下での製造 Superconductor Science and Technology. ,vol. 21, pp. 1- 4 ,(2008)
R Russo, L Catani, A Cianchi, S Tazzari, J Langner, High quality superconducting niobium films produced by Ultra High Vacuum Cathodic Arc arXiv: Superconductivity. ,(2004) , 10.1088/0953-2048/18/7/L01
Daghero D, Delaude D, Stepanov V A, Ummarino G A, Tortello M, Monni M, Palenzona A, Gonnelli R S, MgB 2 のエネルギーギャップに及ぼすLi-Al同時ドーピングの影響 Superconductor Science and Technology. ,vol. 22, pp. 1- 9 ,(2009)
Anant Narlikar, S. N. Ekbote, Superconductivity and superconducting materials ,(1983)