Magnetoresistance of Copper Single Crystals

The anisotropy in the magnetoresistance of copper single crystals has been used to determine the Fermisurface topology in copper. In particular, the {111} neck thickness in the [$1\overline{1}0$] and [$11\overline{2}$] directions has been determined and found to be $0.29\left(\frac{a}{2}\right)$ and $0.26\left(\frac{a}{2}\right)$, respectively, where $a$ is the reciprocal lattice parameter. Sixteen selected crystals have been measured and the data used to obtain information on the open-orbit regions.