Improvement and protection of niobium surface superconductivity by Atomic Layer Deposition and heat treatment

Autor:	Proslier, T., Zasadzinski, J., Moore, J., Pellin, M., Elam, J., Cooley, L., Antoine, C., Norem, J., Gray, K. E.
Rok vydání:	2008
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Materials Science
Zdroj:	Appl.Phys.Lett.93:192504,2008
Druh dokumentu:	Working Paper
DOI:	10.1063/1.2995996
Popis:	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 (XPS) measurements at the surface of cavity-grade niobium samples coated with a 3 nm alumina overlayer deposited by Atomic Layer Deposition (ALD). The coated samples baked in ultra high vacuum (UHV) at low temperature reveal at first degraded superconducting surface. However, at temperatures above 450C, the tunneling conductance curves show significant improvements of the superconducting density of states (DOS) compared with untreated surfaces. Comment: 3 pages, 2 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0808.3427 Zobrazit plný text záznamu View this record from Arxiv