Details

Autor(en) / Beteiligte

• Barber, Richard

Titel

Tunneling and transport measurements of quench-condensed Bi films

Ist Teil von

• Bulletin of the American Physical Society, 2004-03, Vol.49 (1)

Erscheinungsjahr

2004

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We report tunneling and transport measurements of quench-condensed superconducting Bi films. Samples were deposited directly onto both clean glass substrates and over oxidized Al ground planes and tunnel electrodes without the use of a Ge or Sb underlayer. Values for the superconducting energy gap Delta were derived from BCS fits to the tunneling curves, and the transition temperature T_C values were obtained from fits to the Aslamazov-Larkin fluctuation theory. The ratio raise0.7exhbox2Delta !mathordleft/ vphantom 2Delta k_B T_C right.kern-nulldelimiterspace!lower0.7exhboxk_B T_C was found to be significantly different than expected for samples that were deposited onto clean glass for the transport measurement. Better comparisons resulted for samples over the same Al/Al_2O_3 preparation as the tunnel electrode. However, these latter results are complicated by the presence of a parallel conduction path. The results will be discussed within the context of morphological differences arising from the different substrate preparations.