Hall Coefficient of Superconducting and Normal Nb-25% Zr

Hall-coefficient measurements were made on cold-rolled Nb-25% Zr in the zero-resistance mixed state at 4.2°K and in the normal state at 4.2, 77, and 317°K. With sample current densities from 2×${10}^3$ to 1×${10}^4$ A/${\mathrm{cm}}^2$ in fields of 1 and 9 kG, no Hall voltage for the superconducting sample could be observed with equipment capable of detecting voltages as small as ${10}^{-9\mathrm{}}$ V. An upper limit of the superconducting Hall coefficient is, therefore, calculated to be 1×${10}^{-15\mathrm{}}$ ${\mathrm{m}}^3$/A-sec. The values of the Hall coefficient for Nb-25% Zr in the normal state are found to be 1.14×${10}^{-10\mathrm{}}$, 1.05×${10}^{-10\mathrm{}}$, and 0.84×${10}^{-10\mathrm{}}$ ${\mathrm{m}}^3$/A-sec at 4.2, 77, and 317°K, respectively.