@article {1417,
	title = {Persistent superconductivity in ultrathin Pb films: A scanning tunneling spectroscopy study},
	journal = {Physical Review Letters},
	volume = {96},
	number = {2},
	year = {2006},
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},
	month = {Jan},
	pages = {4},
	type = {Article},
	abstract = {<p>By using a low temperature scanning tunneling microscope we have probed the superconducting energy gap of epitaxially grown Pb films as a function of the layer thickness in an ultrathin regime (5-18 ML). The layer-dependent energy gap and transition temperature (T-c) show persistent quantum oscillations down to the lowest thickness without any sign of suppression. Moreover, by comparison with the quantum-well states measured above T-c and the theoretical calculations, we found that the T-c oscillation correlates directly with the density of states oscillation at E-F. The oscillation is manifested by the phase matching of the Fermi wavelength and the layer thickness, resulting in a bilayer periodicity modulated by a longer wavelength quantum beat.</p>
},
	keywords = {SHAPE RESONANCES},
	isbn = {0031-9007},
	url = {<Go to ISI>://WOS:000234758100078},
	author = {Eom, D. and Qin, S. and Chou, M. Y. and Shih, C. K.}
}
