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The fermi surface of copper by positron annihilation Petijevich, Peter

Abstract

A study of the Fermi surface of copper at room temperature has been made by means of a positron annihilation technique. A positron active copper single crystal was placed midway between two “point" scintillation counters operated in time coincidence. The coincidence count rate was measured for various crystal orientations and the count rate interpreted as a measure of the diameter of the Fermi surface. The experiment yields a Fermi surface that is spherical in k-space except for protrusions in the {111} directions which are estimated to subtend an angle of about 20° at k = 0. Within experimental error the results are consistent with those obtained by other methods near 0° K.

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