Accession Number : AD0776144

Title :   Superconductivity at the Surface of Lead Telluride,

Corporate Author : ILLINOIS UNIV URBANA COORDINATED SCIENCE LAB

Personal Author(s) : Miller,David Lee

Report Date : SEP 1973

Pagination or Media Count : 107

Abstract : Ultrathin films of the metals Pb, In, Tl, Sn, and Al were deposited on crystalline PbTe substrates in an attempt to fabricate a system favorable for the observation of an excitonic mechanism of superconductivity. For each of these metals, superconductivity was observed at the PbTe surface. A threshold amount of metal deposited was necessary for superconductivity, and the observed transition temperatures increased as the amount of metal deposited increased beyond the threshold amount. Maximum values of the observed T's at thicknesses less than 100A were 6.75K for In, about 5.25K for Tl, 7.15K for Pb, 3.4K for Sn, and 2.6K for Al. The PbTe substrate surface and the metal overgrowth were characterized by the use of low energy electron diffraction and Auger electron spectroscopy. (Modified author abstract)

Descriptors :   *SUPERCONDUCTIVITY, *SEMICONDUCTORS, LEAD COMPOUNDS, TELLURIDES, SURFACE PROPERTIES, THIN FILMS, CRYOGENICS, METAL FILMS, THESES

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE