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

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

2008-08-26

arxiv.org/abs/0808.3427v1

Appl.Phys.Lett.93:192504,2008

Physics

Condensed Matter

Superconductivity

3 pages, 2 figures

Scientific paper

10.1063/1.2995996

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.

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