Transport Properties Of Neptunium Superconductor Nppd5al2

We measured the electrical resistivity in the current J parallel to[100] and [001] and the Hall coefficient for the magnetic field H parallel to[010] and [001]. The resistivity is anisotropic for the current direction. The Hall coefficient R-H is also extremely anisotropic, revealing that R-H for H parallel to[010] and [001] possesses a positive maximum at 55 K for H parallel to[010], and a negative minimum at 25 K for H parallel to[001], respectively. The temperature dependence R-H is well explained by the skew scattering processes at high temperatures.