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Ginsberg, D.M. Harris, Richard Elgin 2011-07-13T15:15:58Z 2011-07-13T15:15:58Z 10000-01-01 1969 The ratio Ts /Tn of the far infrared radiation transmitted through a thin film in the superconducting state to that transmitted through it in the normal state has been measured for several samples of amorphous bismuth and gallium. The transition temperature Tc of each film was also measured. Thicknesses were approximately in the range 50 to 200 ~. Numerical calculations based on the strong-coupling theory of superconductivity and on tunneling data produced theoretical values of Ts /Tn for comparison with the data, showing moderately good agreement. For each sample the energy gap 2wg was determined. For bismuth and gallium, Tc and 2wg decrease with increasing film resistance. It was also noted that for both materials, the abrupt resistance change at about 15 K, characteristic of thicker amorphous films, appeared instead as a gradual change in resistance beginning at temperatures higher than 20 K. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-13T15:15:58Z No. of bitstreams: 1 1969_harris.pdf: 3232640 bytes, checksum: 34e2ef1c87fbb3eeb0a3566504c2cf0d (MD5) Made available in DSpace on 2011-07-13T15:15:58Z (GMT). No. of bitstreams: 1 1969_harris.pdf: 3232640 bytes, checksum: 34e2ef1c87fbb3eeb0a3566504c2cf0d (MD5) Previous issue date: 1969 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-13T15:15:58Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:33:07-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 6074596 http://hdl.handle.net/2142/25790 en 1969 Richard Elgin Harris far infrared radiation superconducting thin films amorphous bismuth amorphous gallium Transmission of far infrared radiation through thin films of superconducting amorphous bismuth and gallium Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.