Accession Number : AD0710651

Title :   TRANSPORT PHENOMENA IN METALS AT LOW TEMPERATURES.

Descriptive Note : Final rept. 1 Jan 66-30 Jun 70,

Corporate Author : OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS

Personal Author(s) : Yaqub,M.

Report Date : AUG 1970

Pagination or Media Count : 10

Abstract : Electrical conductivity of cylindrical single crystals of high purity gallium has been measured between 1.1 degrees K and 4.2 degrees K as a function of crystalline orientation and diameter using the highly sensitive superconducting interference galvanometer capable of detecting 10 to the -14th power volt. Electrical conductivity of the single crystal films of high purity gallium has been measured between 1.1 degrees K and 20 degrees K as a function of orientation and thickness. Thermal conductivity of cylindrical single crystals of gallium has been measured as a function of orientation and diameter for the three principal axes between 1.1 degrees K and 4.2 degrees K. The thermo emf of single crystals of gallium has also been measured as a function of orientation between 1.1 degrees K and 4.2 degrees K using the superconducting interference device. An apparatus for the measurement of Kapitza Boundary resistance by using a second sound resonating cavity has been built and successfully operated. A sub 3 He-sub 4 He dilution refrigerator for extending the work to lower temperatures (between 1 degrees K and .1 degrees K) has been constructed and is ready for preliminary testing. (Author)

Descriptors :   (*METAL FILMS, THERMAL CONDUCTIVITY), (*GALLIUM, ELECTRICAL CONDUCTIVITY), SINGLE CRYSTALS, CRYOGENICS, HELIUM, SUPERCONDUCTORS

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE