Accession Number:

AD0613126

Title:

OSCILLATORY MAGNETORESISTANCE IN GRAY TIN,

Descriptive Note:

Corporate Author:

NORTHWESTERN UNIV EVANSTON ILL

Personal Author(s):

Report Date:

1964-01-10

Pagination or Media Count:

8.0

Abstract:

The oscillatory component of magnetoresistance has been measured for single crystals of n-type gray tin at liquid-helium temperatures. The period of oscillation is independent of magnetic field direction, confirming an isotropic effective mass and, therefore, a conductionband edge at the center of the Brillouin zone. Oscillations were also observed in a polycrystalline specimen. Carrier concentrations deduced from the oscillatory period are in reasonably good agreement with values obtained from the Hall coefficient over a range of almost two orders of magnitude in this parameter. An electron effective mass of 0.024 m sub o was obtained from the field and temperature dependence of the oscillatory amplitude for samples having carrier concentrations on the order of 10 to the 16 powercu cm. Nonthermal damping of the oscillations is attributed mainly to inhomogeneities in the impurity distribution. The experimental results are compared with theory. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE