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×{}10³ to 1×{}10⁴ A/cm² 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 V. An upper limit of the superconducting Hall coefficient is, therefore, calculated to be 1×{}10^-15 m³/A-sec. The values of the Hall coefficient for Nb-25% Zr in the normal state are found to be 1.14×{}10^-10, 1.05×{}10^-10, and 0.84×{}10^-10 m³/A-sec at 4.2, 77, and 317^∘{}K, respectively.