Electrical Resistivity of Yttrium Single Crystals

Two samples of yttrium cut from the same single crystal were used to determine the electrical resistivity parallel and perpendicular to the $c$-axis of the hexagonal close-packed metal. Measurements were made over the temperature range from 1.3 to 300°K. A large anisotropy was observed, with $\frac{{\rho }_{\perp }}{{\rho }_{\mathrm{II}}}=2.1\mathrm{}$ at room temperature. Values for the polycrystalline resistivity over the temperature range indicated were computed from these data and were found to fit a Grüneisen law with $\theta =187.5\mathrm{}°$K. The computed polycrystalline values were also in good agreement with the measured resistivity of a polycrystalline sample.