Improvement and protection of niobium surface superconductivity by atomic layer deposition and heat treatment

Proslier, T.; Zasadzinski, J.; Moore, J.; Pellin, M.; Elam, J.; Cooley, L.; Antoine, C.; Norem, J.; Gray, K. E.
November 2008
Applied Physics Letters;11/10/2008, Vol. 93 Issue 19, p192504
Academic Journal
A method to treat the surface of Nb is described, which potentially can improve the performance of superconducting rf cavities. We present tunneling and x-ray photoemission spectroscopy measurements at the surface of cavity-grade niobium samples coated with a 3 nm alumina overlayer deposited by atomic layer deposition. The coated samples baked in ultrahigh vacuum at low temperature degraded superconducting surface. However, at temperatures above 450 C, the tunneling conductance curves show significant improvements in the superconducting density of states compared with untreated surfaces.


Related Articles

  • The Electronic Structure Band Structure of KFe2As2. Zabidi, Noriza Ahmad; Abu Kassim, Hasan; Shrivastava, Keshav N. // AIP Conference Proceedings;9/14/2009, Vol. 1169 Issue 1, p261 

    The layers of FeAs upon doping with K become superconducting. Hence we use the density functional theory to calculate the band structure of one layer of FeAs atoms by using spin polarized as well as impolarized orbitals. We find that the Fermi energy for unpolarized orbitals is 7.02 eV which...

  • TRATAMIENTO DE LAS FLUCTUACIONES DE ESPÍN EN SUPERCONDUCTORES DE BANDA-d. Páez, A. M. Raba; Parra, R. Baquero // Revista Colombiana de Física;2007, Vol. 39 Issue 1, p329 

    Spin fluctuations have been proposed as the mechanism in high TC superconductors. But if paramagnons do not create Cooper Pairs if might destroy them. We analyze the role of paramagnons in superconducting Nb and the extension to T

  • Comparison of the Role of Moderate Heat Treatment Temperatures on the Thermal Conductivity of Ingot Niobium. Chandrasekaran, S. K.; Bieler, T. R.; Compton, C.; Hartung, W.; Wright, N. T. // AIP Conference Proceedings;3/31/2011, Vol. 1352 Issue 1, p131 

    The thermal conductivity of superconducting niobium varies, in a yet unknown way, due to the processing history of the ingots and manufacturing processes during fabrication into cavities. Here, a theoretically based model is used to relate thermal conductivity to the metallurgy and processing...

  • Design of New Superconducting Materials, and Point-Contact Spectroscopy as a Probe of Strong Electron Correlations. Greene, Laura; Arham, Hamood; Hunt, Cassandra; Park, Wan // Journal of Superconductivity & Novel Magnetism;Oct2012, Vol. 25 Issue 7, p2121 

    At this centenary of the discovery of superconductivity, the design of new and more useful superconductors remains as enigmatic as ever. These materials play crucial roles both for fundamental science and applications, and they hold great promise in addressing our global energy challenge. The...

  • Electronic structure of prototype AFe2As2 and ReOFeAs high-temperature superconductors: A comparison. Nekrasov, I. A.; Pchelkina, Z. V.; Sadovskii, M. V. // JETP Letters;Sep2008, Vol. 88 Issue 2, p144 

    We have performed ab initio LDA calculations of the electronic structure of newly discovered prototype high-temperature superconductors AFe2As2 (A = Ba, Sr) and compared it with the previously calculated electronic spectra of ReOFeAs (Re = La, Ce, Pr, Nd, Sm). In all cases, we obtain almost...

  • Enhancement of the upper critical field of Nb3Sn utilizing disorder introduced by ball milling the elements. Cooley, L. D.; Hu, Y. F.; Moodenbaugh, A. R. // Applied Physics Letters;4/3/2006, Vol. 88 Issue 14, p142506 

    Nb3Sn was prepared by milling Nb and Sn powder mixtures followed by limited reactions to restrict disorder recovery. Although disorder reduced the superconducting critical temperature Tc, the concomitant electron scattering increased the upper critical field μ0Hc2 to as high as 35 T at 0 K,...

  • Synthesis and characterization of flavylium salts having three types color depending on recrystallization conditions. Ito, Fuyuki; Tanaka, Nobuaki; Katsuki, Akio; Kakehi, Akikazu; Fujii, Tsuneo // Research on Chemical Intermediates;2004, Vol. 30 Issue 3, p331 

    Three types of flavylium salts (F'Vs yellow green and red) have been synthesized and the colors depended on recrystallization conditions. The existence of these color states was confirmed by diffuse reflectance spectra. The spectra were almost the same as the absorption spectra in ethanol...

  • Quasiparticle interference and superconducting gap in Ca2−xNaxCuO2Cl2. Hanaguri, T.; Kohsaka, Y.; Davis, J. C.; Lupien, C.; Yamada, I.; Azuma, M.; Takano, M.; Ohishi, K.; Ono, M.; Takagi, H. // Nature Physics;Dec2007, Vol. 3 Issue 12, p865 

    High-transition-temperature (high-Tc) superconductivity is ubiquitous in the cuprates containing CuO2 planes, but each cuprate has its own character. The study of the material dependence of the d-wave superconducting gap (SG) should provide important insights into the mechanism of high-Tc...

  • PROOF STRENGTH BEHAVIOR OF NB3SN BRONZE ROUTE WIRES BETWEEN 300 AND 4 K. Weiss, K. P.; Nyilas, A.; Thoener, M.; Seeber, B. // AIP Conference Proceedings;3/3/2008, Vol. 986 Issue 1, p293 

    Outer stabilized Nb3Sn bronze route wires were investigated at room temperature, at 7 K and 4 K with respect to their stress versus strain behavior using the recommendations of the draft foreseen for a new tensile measurement IEC standard. A significant decrease of the 0.2% proof strength is...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics