@article {156291,
	title = {Characterization of niobium point contacts showing Josephson effects in far infrared},
	journal = {Journal of Applied Physics},
	volume = {49},
	number = {9},
	year = {1978},
	pages = {4873-4880},
	abstract = {
	The high-frequency behavior of\&nbsp;niobium\&nbsp;cat-whisker\&nbsp;point contacts\&nbsp;has been studied using\&nbsp;radiation\&nbsp;from an optically pumped far-infrared laser. When the\&nbsp;point contacts\&nbsp;are classified on the basis of their high-frequency performance, their dc\&nbsp;I-V\&nbsp;curves fall into recognizable groups. We find that the ac\&nbsp;Josephson effect\&nbsp;has a strong correlation with the gap-related structure on the\&nbsp;I-V\&nbsp;curve, but none at all with the apparent excess current observed in all the contacts. For high-performance junctions, these and other features of the\&nbsp;I-V\&nbsp;curves are very reproducible from contact to contact, allowing a comparison with the available theories. The experimental evidence seems to suggest that our\&nbsp;point contacts\&nbsp;are best modeled as extremely small metallic constrictions.

},
	url = {https://aip.scitation.org/doi/10.1063/1.325520},
	author = {Weitz, D. A. and Skocpol, W. J. and Tinkham, M.}
}
