Accession Number : AD0656609

Title :   SIZE EFFECTS IN THE TEMPERATURE VARIATION OF ELECTRICAL CONDUCTIVITY OF EPITAXIAL GOLD FILMS,

Corporate Author : ILLINOIS UNIV URBANA COORDINATED SCIENCE LAB

Personal Author(s) : Jacobs,J. T.

Report Date : AUG 1967

Pagination or Media Count : 100

Abstract : Measurements of the resistivity of evaporated epitaxial gold films were made over the temperature range 4.2 to 300K. A computerized data analysis scheme, in which the operator played the part of a judgement element in the feedback loop, was used to fit the Fuchs-Sondheimer theory of size effects to the experimental data. The results for films thinner than 4000 A are that the degree of specularity, p, varied between 0.5 and 0.95, while the static lattice imperfection resistance, oi, varied between 5.2 and 9.0 x 10 to the minus 8th power ohm-cm. An anomalously high film resistivity in the temperature range 15 to 60K was observed. It was attributed to small angle electron-phon scattering. Date for films thicker than 4000 A could not be fit exactly to the Fuchs-Sondheimer theory below 15K and above 77K by a single set of the parameters p and o. The cause of this mismatch is unknown. Measurements on an 8.56 micron thick gold film indicate that the lattice resistivity between 8 and 20K varied as T4.4. The gold films, of thickness between 1300 A and 8.56 A, were vacuum deposited at rates in excess of 30 A/sec onto Tanganika muscovite mica held at 300C. The films were vacuum annealed before they were cooled to room temperature. They were removed from the vacuum and mounted in a liquid helium dewar. Measurements of thin film resistivity vs. temperature were automatically recorded on punched paper tape. A computer program was written to numerically calculate the Fuchs-Sondeimer integral for size effects on the electrical conductivity. A CDC 1604 computer was used to make the theoretical computations. (Author)

Descriptors :   (*FILMS, *ELECTRICAL CONDUCTIVITY), TEMPERATURE, GOLD, EPITAXIAL GROWTH, ELECTRICAL RESISTANCE, ELECTRONS, SCATTERING, METALS, THICKNESS, ELECTRIC FIELDS, EQUATIONS, GRAPHICS, TABLES(DATA), COMPUTER PROGRAMS, DATA PROCESSING, MATHEMATICAL ANALYSIS

Subject Categories : Physical Chemistry
      Computer Programming and Software
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE